Conception Calculator: Find Your Conception Date
Medically Reviewed by Dr Afzaal Ahmad
Table of Contents What is a Conception Calculator How Does It Work? How is the Conception Date Calculated and What is it Based On? Facts about Conception Calculating based on your Estimated Due Date Calculating Based on your LMP Calculating Based on Ovulation Dates/Fertile Period Calculating Based on your Ultrasound What Can Affect Conception Dates Is the conception calculator practical? FAQ’s What is a Conception Calculator A pregnancy conception calculator can help you determine when your baby was conceived, based on a few different factors such as the first date of your last menstrual period (LMP), the due date of
Conception Calculator: Find Your Conception Date
About The Author
Daniella Hall
Mom to an amazing and crazy toddler, Aaron, with a passion for women’s health and wellness. One the side she also loves being outdoors, baking and creating cooking videos with Aaron
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Please help me…my periods usually come on the 28th then lasts for 4 – 5 days. on April 2018 they came on the 28th till the 1st of May 2018. on the 14th of May they started again till the 17th, I had sex unprotected sex with my boyfriend between the on the 19th n took the morning after pill on the 20th of May, on the 24th of May I had unprotected sex with my ex boyfriend but he nutted outside. Silly me on the 27th and 28th of May we also had unprotected sex. My boyfriend came back on the 3rd of June and we had sex(unprotected)….on the 5th of June I took the home pregnancy test and its came negative, I know I had to repeat it since I had countless number of unprotected sex with 2guys, on the 12th of June I took another test and its came with 2lines, one was faint so I bought clearblue and it said 1-2weeks of which I have to add another 2weeks, which comes up to 4weeks pregnant…. I’m failing to count who is the father since I kinda had irregular periods, the estimated due date says 15 February 2019…..please help me, who is possible to be the father. Thank you in advance
Hello Sansa, to determine who the father of your child is, use the below link:
https://womanjunction.com/conception-calculator-find-your-conception-date/
I had sex with bf 11th thru 18th before he travelled abroad and had protected sex with this #2guy on the 24th, now I’m pregnant and EDD is 21/2/19 who’s like to be the father last period was May 7th
Based on the calculator and using the EDD your approximate dates of conception were May 27th through June 4th. Based on LMP your dates of conception would have been from the 17th to the 24th. If you had protected sex then I would say the first however if something happened with that protection than the only way to know if through a DNA test, which I would recommend.
Hi I need your help please my LMP was on the 28th of September 2017 my periods are irregular and I slept with guy 1 on the 29th until the 13th of October and I took out my implant on the 10th of October and its removal date was the 6th of October and I slept with guy 2 on the 16th of October and my due date is 5 July.whose the father?
Hi Portia, I would recommend a DNA test honestly. But it could be any of them honestly depending on when you ovulated, especially since you state irregular periods. However, based on the calculator that you commented on, your conception period was anywhere from the 8th to the 16th of October.
Hiya lady’s I was wondering if someone could help me I am 23 weeks pregnant my last period was on the 7th January me and my boyfriend broke up over the Xmas time I have sex with someone else on the 16th of January and got back with the boyfriend on the 19th who is the dad I really need help
Hello Zoejo, use the below link to find out the day that you conceived:
https://womanjunction.com/conception-calculator-find-your-conception-date/
Hi i had sex with a guy sometime December and the other one in January and my due date is September who could be the father????😢
Hello Prexious, use the below link to find this out:
https://womanjunction.com/conception-calculator-find-your-conception-date/
Hey my period was on the 16th of December 2017 n my cycle is 29 days I had sex with ma ex bf on the 26th December and hooked up with another guy on the 7th of January 2018 and took a test on the 13th January and it came out positive, who could be the father??
Hi there Shirley, use the below link to find this out:
https://womanjunction.com/conception-calculator-find-your-conception-date/
Hi, I had unprotected sex with my bf on the 28 of April and again with this guy on the 3rd of May and had mild pains the following day, on the 10th of May I had cramps like period pains and started feeling pregnant after that, I missed my period which was supposed to start on the 14th May n I knew I was pregnant. I went for u/s on 1 June and the doctor said I was 4weeks pregnant.
Hello Thuly, to find out who you are pregnant for, use the below link to calculate your conception date:
https://womanjunction.com/conception-calculator-find-your-conception-date/
I need help…. I had unprotected sex with my boyfriend on May 4th… Period came May 10-15… Had randomly with this guy May 19th… Had unprotected sex again with my boyfriend May tha 26th and 27th… Missed my period for the month of June….
Am i pregnant??
How will i know who the father is??
HELP!!!!
Hi Shareer, well you could be prenant. I would take a pregnancy test. However, the 19th was one day before your scheduled fertile period and the 26th was two days after your scheduled period. I would recommend a DNA test once the baby is born as that is the only way to determine accurately who the father is.
Hi I had sex with this guy on april 2nd n then I came in my period the very next day on the 3rd of April now we used protection but the condom broke and I tried to douche myself out with baking soda (was that a bad idea) my period only lasted like 3 or 4 days and from then on I had sex with my boyfriend randomly through out the month of April I need to when who is likely the father of my baby I have yet to get a due date cause the dr said I’m too early to tell how far I am and that on the 28th of April my hcg level just barely made it past the mark for a positive test yet I’m confused and worried help
Hello Rebecca, douching with baking soda does not prevent pregnancy. Use the below link to find out who your baby’s father might be:
https://womanjunction.com/conception-calculator-find-your-conception-date/
Hello, i am really worried and i need some help. I had protected sex on 23rd of october 2017 and then unprotected sex on 30th of october. I have irregular cycles with average cycle length apr.35 days. My lmp was 8th of october and lasts 7 days. I had a very early ultrasound on 5/12/17 which showed me 6w4d (but according to my lmp i was 8w2d). I knew from the beginning that my baby is a week smaller because i had late ovulation..but according to my ultrasounds i’m having,i have different calculations that leading to different ovulation days. At my A scan on 17th of january my EDD was 22of july. At my B scan on 23rd of march EDD is 25of july.mu last ultrasound was 4th of may,yesterday and it counted me 29 weeks that means my EDD is on 20 of july.(with an ovulation day on 27th or 28th of october). So if sperm live aprox.5 days in a womans body can i got pregnant from the guy with protected sex?i was sure that nothing gone wrong,condom didnt break,i saw sperm inside the condom and we also used a condom from the beginning. I am now in my 3rd trimester,havi g a wonderful relationship with my boyfriend,guy i had unprotected sex. Also the day after unprotected sex when i went to the toilet in the morning i had an egg-like discharge..sperm left to me inside the whole night but i am still worried..please just tell me your opinion! 😣😣😣
I also carry a baby boy …
Hi Veronika, congratulations first. Second, most likely it would be the person that you had unprotected sex with, however the only way to be sure is to have a paternity test. When used correrectly, condoms are extremely reliable when it comes to preventing pregnancy. Good luck.
Hi, slept with guy #1 on the 22nd July 2017 and slept with guy #2 on the 1st and 2nd of August 2017 and slept with guy #1 again on the 16th of August 2017 …EDD 05 May 2018…who is likely to be the dad?
Hi Mbali, your most likely window for conception was August 8th through August 16th. So most likely guy #1. That being said, the only way to know for sure is to have a paternity test when the baby is born.
I had unprotected sex with this guy January 18th and the other guy on January 24th my due date is October 13th . Which one is the farther ?
Hi Anna, well according to the conception calculation which I will provide the link to, it could be either, becuase your possible dates of conception where between the 16th to the 24th. THe only way to know is a paternity test when the baby is born.
my last period was on the 4 of December I think I have a 23 day cycle I had sex on the 11 of December with guy 1 one which was one day after my period stop had sex with guy 2 from the 19 of December upwards what is my conception date
Hi Donna, based on a 23 day cycle, it could have been the first guy. However if your cycle was closer to a 28 day cycle it could have been the 2nd guy. At this point your only assurance as to whom the father is, is to get a paternity test.
I had unprotected sex with one guy on the 27 February after my period, and with another guy on the 8 March during ovulation, my period was on 22-25 February, now I’m pregnant, who gonna be the father?
Hi Winnie, most likely the guy that you had sex with during your ovulation period.
My period is irregular I had sex in a guy October 15and 16.and another guy in 17 ….and sex 22 and 23 for the first guy..what is my conception date
Hi Jyl, you didn’t really give us any information to determine your conception date. We don’t have a EDD or a date of your last period and the length of your cycle. If you share some of that information we could be able to assist you.
hello, I’m really confused and need your help. Let me please explain my situation :
My periods are regular : 27 days cycle
21st october 2017 : menstruation (5 days)
4 th novembre : had unprotected sex with #1 Guy but i took ellaOne within 11 hours the same day and He pulled out
16th november 2017: menstruation ( from 16 to 21 november)
22/23/25 november 2017: i had unprotected sex with #guy 2 And he came on me
12th december 2017: i missed my period but i have just some brownish drops
16th december 2017: blood pregnancy test HCG positive
=> Hcg : 1730 / ml
18th December 2017=> Hcg : 3227 / ml
22nd december : second ultrasound wich shows 10.2 mm gestational sac / GA 4w6d
28th December 17: third ultrasound wich shows a 16mm gestational sac and 5w6d GA
29th december 17 : HCG test 27700 / ml
4th january 18: HCG test 46790 / ml
6th january 18 : fourth ultrasound wich show a CRL 14,3 mm and GA 7w5d and EDD 20/08/2018
12th january 18 : 108 000 /ml
paternity test needed in this case ? Guy 1 could be the father?
Hi Sandra, most likely guy #2 is the father. Based on you EDD, your most likely conception date was November 23rd through December 1st, which would put you in that time frame for guy #2. If you are still unsure I would get a pregnancy test, especially if there is really any question about it.
Hi i had unprotected sex with my boyfriend in april 19 and 21 2019 and my last period starts march 27 up to last day of march. In May 15 i get pregnancy test and its possitive ..what is my exact Due date delivery..in ultrasound its January 3 2020 but its already January 7 now..
Hello Ann, sorry we saw your message too late. I hope that you had an easy birth and that you and the baby are doing fine.