When you are having sex, pregnancy is always a real possibility. Sex, like other fun activities, comes with certain risks if you are not using protection, with STI’s and unwanted pregnancies being the most obvious ones.
If you want to know what’s the chance of getting pregnant if you had unprotected sex you have come to the right place.
Like others, you will hear many rumors about where and when you could get pregnant. For some women, the thought of getting pregnant is met with great joy and anticipation, while for others it’s a cause of worry.
This is why most women in the reproductive age or the ones who are trying desperately to conceive will have many questions or doubts about their chances of conceiving.
We will look further at this below to help you understand more about unprotected sex and pregnancy.
What’s the Chance of Getting Pregnant If You Had Unprotected Sex
There is a good chance that you could get pregnant nearly any time that you engage in sexual intercourse without using an effective birth control. This scenario is familiar to most women.
Pregnancy usually occurs around the ovulation period, the time when your ovary releases egg in the fallopian tube. If you are having regular periods, ovulation will take place midway between your menstrual periods.
Ovulation usually happens midway between the first-day of 2 consecutive periods, but this can vary from the eight day to the twentieth day of a 28-day cycle.
Researchers calculate the average risk at varying times in a monthly cycle of a woman, but you should know that your risk can be lower or higher.
You cannot know the definite time of your ovulation, which is why the researchers use the monthly cycle of a woman when calculating the average risk for pregnancy.
Figuring Out the Chances of Getting Pregnant If You Had Unprotected Sex
You are more likely to conceive if you have unprotected sex during the middle 2 weeks of your cycle. The time varies, but many women ovulate about day 14.
You will have the highest risk of pregnancy by having unprotected sex one or two days before your ovulation starts; when the ovary releases the egg.
This is a 30% chance. The risk of having unprotected sex and getting pregnant three days prior to ovulation is 15%. You will have a 12% chance on the ovulation day. [1]

Photo: Bigstock.com
In the real world, large studies show that women who engage in unprotected sex during mid-cycle have a much lower chance of getting pregnant as the risk is around 5.8%.
This is because you will have a much lower risk of getting pregnant if you engage in any sexual relations on the ovulation day and any day besides the three days prior to.
Not Getting Pregnant After Having Unprotected Sex for Months
There are times when having unprotected sex is not enough for you to get pregnant. You could be doing this for months with no luck.
Thankfully, there are certain things that you could do to increase your chances if it’s taking longer than expected for you to conceive.
This includes doing thinks like monitoring your ovulation, using an ovulation predictor kit, charting your basal body temperature, as well as checking and observing your cervical mucus.
When you have an idea of your ovulating time, you can start to time your sexual activities around that period. If you are using this method, you must ensure that you are having sex 2 days before your ovulation day or every other day during the week of your expected ovulation. This will boost your chances of conceiving.
If it’s a case where you have been engaging in unprotected sexual activities for more than six months without success, you could visit your doctor or ob/gyn to know about the alternative treatments that you could use for fertility problems. There are several solutions available and they are very effective.
How to Know When You Get Pregnant
The most common sign of pregnancy after unprotected sex is missed period. However, this missed or late period is not a sure sign as there are many other things that can cause it besides pregnancy.
This includes using birth control that contains hormones, stress, sickness, improper eating habits, or too much exercise.
It is pretty common for teens to have periods which come later than normal or missed periods because it could take several years for them to have a regular cycle.
So, the best way for you to know if you are pregnant is to do a pregnancy test. These are easy to get nowadays because they are available at drugstores or health centers.
It is important to note that the home pregnancy tests are ninety-nine percent accurate if taken after you miss a period.
Hopefully, you will now know what’s the chance of getting pregnant if you had unprotected sex.
Do you have a question about your period, ovulation, pregnancy or other related topic? Check out our Frequently Asked Questions page.
Wondering if you’re pregnant? Try our Online Pregnancy Quiz and get a rough estimate of your chance of being pregnant.
Read this post to learn more about when is the right time to take a pregnancy test.
References
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1. http://www.thedoctorwillseeyounow.com/content/womens_health/art3356.html





Hi my bf and I had sex 2 days after my period. So i had my period last aug.24-30. We had unprotected sex last september 1 and he ejaculated inside me. Is there a possibility I could be pregnant?
of course there is, take a day after pill as soon as possible and consult your gynecologist
We had sex on 25 august and she’s expecting her period on 13th September. What are her chances of getting pregnant?
Hello Emmanto Law, According to this ovulation calendar, 17 days out from your period is the IDEAL time for intercourse. Sperm can stay alive in the body up to five days so having sperm in route to the egg slightly before the egg is released gives them a bit more time to reach the egg.
Started my period on the 29th Aug and my bf and I had unprotected sex that very night. Things happened so fast so didnt managed to use protection as normal. Took Plan B in about less than 48 hours. My period has since ended on 2nd Sept. but I’ve still been feeling slight cramping. Could it be the side effects of taking Plan B? Also, what are the chances of me getting pregnant? My periods are regular and my cycles are about 27-29 days.
Hi Effy, SIDE EFFECTS OF PLAN B INCLUDE: Nausea/vomiting, abdominal pain, tiredness, dizziness, changes in vaginal bleeding, breast tenderness, diarrhea, or headache may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly. You took the pill properly and Your next most fertile period is September 10, 2015 to September 14, 2015 so i wouldn’t worry too much about being pregnant.
Thanks for the reply. I guess I’m just freaking out because it’s been three days past my period but I’m still having mild bleeding (which I think it’s really the side effects of plan b). I was freaking out about it being implantation bleeding but realized it can’t be that soon. Besides, it isn’t fertile period yet so I’m probably just stressing and worrying too much?
Hi I just want to ask do you have your period now? Coz I am also 13 days late of my period I also took a emergency morning pill…but the gynacologist told me that I am 90% not pregnant…but still worried coz my period not come
My last period began on August 17. It lasted until the 24th. However my husband and I had unprotected sex starting on the 22nd and going until the 25th. That was when we found out my iud had fallen out of place. My cycle is generally a little shorter than 28 days. Can I be pregnant?
Hi Shannon, If your IUD fell out of place anything it is possible to get pregnant when you have unprotected sex you should probably check with your doctor to make sure.
I had my last period on Aug 6th till Aug 10th. My fiance and I had unprotected sex on Aug 28th at 8 PM. Will I get pregnant? My cycle is usually between 24 to 28 days. Please advise.
Hello LS, Your next most fertile period is August 18, 2015 to August 22, 2015. You would have had sex pass your days but anything is possible when you have unprotected sex so take a test to be sure.
Had my menses on 22nd of august and had sex on 1st around 10pm and 2nd around 9am. Am on 26days circles. Whats are my chances of becoming pregnant?
I’ve had unprotected sex with my girlfriend a couple times and we had it yesterday and today she said that she was bleeding and we’re worried that she might be pregnant. Her period is normally in two weeks. Last month it was not regular and it was early. What does this mean?
Hello Earl, pregnancy is always possible if you are not using protection. However, bleeding after sexual intercourse should be checked out by a doctor.
Hi! I had my period on 25 Aug and had unprotected sex on 26 & 27 bleeding stops on 31 aug, but now its bleeding again on 2 Sep with aches in tummy am I pregnant?.
Hi Sandra, If you have a regular 28 day cycle Your next most fertile period would be September 06, 2015 to September 10, 2015. But if it is irregular you could be pregnant if you ovulate earlier. visit your doctor or wait and take a test.
I had sex on the 6th of August and found out on the 27TH of august that I was 3 weeks pregnant so would it have been from that or before. ? Can’t remember when my last cycle was. Thanks
Hi Kez, sperm can live in the body for up to five days, so the day you had sex is not necessarily the date you conceived knowing your last period would be very helpful in finding out.
please I need your help, I had sex with my bf, on the 22 August 2015, again the next day, I dd.. that was Sunday, than a day pass by which was Monday, then on the 25 of August I did , then 0n the 26 again, actually my boyfriend did withdrawal during sex, so with little idea about a pregnancy test, o took 1 Friday on the 28 of AUGUST 2015, it was negative, then Monday on the 31 I took another one and it come out positive then the next day I took another 1 …which gave me the same result positive, is this possible? and how long is my pregnancy? pls reply to my email…
What was the date of your last period? What is the length of your cycle? The answers to these questions are needed in order to provide an accurate response.
Hi dear, my period started 28th of august and ended 2nd of sept. I slept with my boyfriend that same day, what’s the possibility of getting pregnant
Hello,I had a sex with my gf on 29 Aug at 6:00 am…..What are the chances of getting pregnant when her last period was started on 22 Aug and totally end up to 26 Aug….Her menstrual cycle is about 30 days..She consumed a contraceptive pill on 30 Aug at 4:00 pm..What to do if pill was not worked……..Plz help soon….
Hello,I had a sex with my gf on 29 Aug at about 6:00 am …What are the chances of getting pregnant when her last period was started on 22 Aug and totally end up to 26 Aug….Her menstrual cycle is about 30 days.She consumed a contraceptive pill on 30 August at 4:00 pm……Plz help soon…..
Hi.. my start date of my last mensus was on 13 July 2015. After that me & hub had our sex activity every weekend till last Sunday 30 Aug 15. And yet as of today i still haven’t gotten my menses.. i started a slightly vomiting since the last week of August 2015 till today. I did try a home pregnancy test but its negative..
Any chances i am pregnant?
Since you have been vomiting for some time, you need to see your doctor. Also, please confirm the number of days in your menstrual cycle.
Soo uhh i am having a hard time understanding the whole thing. I started my period around like august 16 and me and my boyfriend have been having sex every since august 22- september 1 . Could i be pregnant ? I need a better understanding
If you have a regular 28 days cycle, based on the dates provided you would be most fertile from August 28 to Sept 1. To increase your change of being pregnant, you must track your fertile days and have sex before and during that time.
The article in this link will help you to understand http://womanjunction.com/menstrual-cycle-calculating-manually/ . To make it easier for you I’ve highlighted the critical points :
*The length of the menstrual cycle varies from woman to woman. Whilst the average menstrual cycle is around 28 days, it can be as low as 24 days and as high as 34 days.
You need to confirm the number of days in your cycle or the length of your cycle in order to determine your most fertile days.
*To determine the length of your menstrual cycle, count from the day your period starts to the day before your next period starts. For instance, if your period started on August 5 and ended on August 31; you would have a 27 days cycle.
*The chances of getting pregnant is higher during ovulation. Ovulation usually occurs between 12 and 14 days before your period.
Hi, my boyfriend and I had unprotected sex the entire week of ovulation. My next period is supposed to come on September 11, but can I be pregnant?
Hi Tanny, Yes it is possible for you to be pregnant especially if you have sex around the time of your ovulation. The only way to know for sure is to take a pregnancy test.