Medical Questions > Pregnancy Forum > Pregnancy Calendar Conception : When did I Conceive ? Forum

Who is the father? (Page 1)

I posted this a couple of days ago and I'm not sure why it was deleted, but I need some help. My LMP was 12/25/2009. It lasted 5 days. I had sex with man #1 on 12-31-09, 1-1-10, 1-2-10, and 1-3-10. He did not use the pull out method. On 1-10-10, I had sex with man #2 using the pull out method. On 2-28-2010 I had an ultrasound and blood tests that showed I was 10 weeks, 3 days pregnant. Based on this, I assumed the due date would be 9/23/10 (give or take a few days). On 5-6-2010 I had another ultrasound that showed I am 18 weeks, 4 days pregnant with a due date of 10/4/10. Who is most likely the father of the baby? I've heard to base it off of the ultrasound in the first trimester since those are the most accurate. Thanks for any help anyone can provide.
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replied May 11th, 2010
Especially eHealthy
Serra, These two sets of gestational age dates you give points to ovulation/conception around 1/11/2010 and 1/10/2010.

That will mean that sex between around 1/6/2010 and 1/12/2010 got you pregnant. So it looks like man #2 did not control his ejaculation good enough and pulled out too late. This is not unusual. In typical use, pull out has a failure rate of over 25%. And if you add alcohol, it is one huge failure.

When you determined your first due date (9/23/2010), you did not count forward far enough. Your doctor is using a 40 week calendar, not a 38 week calendar. This is fairly normal and if you are not aware of it, you will get to the wrong dates like you did.

Best of luck!
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replied May 12th, 2010
Can you explain how you determined the first due date? I counted back 10 weeks and 3 days from 2/28/10 and got 12/31/09 as the date of conception. I then counted 38 weeks from the date of conception to get the due date. Also, if sperm live up to 3 days in a woman''s body, could man #1 have gotten me pregnant, theoretically, since the last encounter with him was on 1/3/10? I''m just really confused since the week of 1/10/10 (only just days after I slept with man #2,) I noticed the sore breasts that go along with pregnancy and thought it would have been too soon for implantation with man #2.
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replied May 12th, 2010
Especially eHealthy
Serra, I know this is confusing and I do not understand myself why doctors do this. After you counted back 10 weeks and 3 days, you should have countted forward 14 days to get to your actual conception/ovulation date. The scan dates are based on a 40 week calendar and start at some mythical LMP date 2 weeks before ovulation. Sometimes you are lucky and if you have perfectly average cycles, it will actually match your LMP date. In practice however it is just plain confusing and it causes friction in countless marriages because of the fact that the man might not have been around on this mythical week 0 day 1.

Ovulation can also cause the sore boob effect.

If we accept that some miracle happened and man #1's sperm survived 5 full days and they were still healthy enough to chase after an egg, it will mean that you had to ovulate between Jan 2 and Jan 8. It is certainly possible that you could have ovulated on Jan 7 or 8. There is thus a slight chance that man #1 can be the father.

It is all a case of the odds and only a paternaty test can tell for sure. The odds are higher that it will be man #2 based on the details you gave here. If you are sure that man #2 was fully in control of himself, sexually experienced and that he indeed did not ejaculate during foreplay or through masturbation the few hours before sex, and that he definitely pulled out with plenty of time to spare, then man #1 must be the dad.

I hope this helps to explain some of the calculations and the odds.

Take care!
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replied June 12th, 2010
Susan, I have been to the doctor several times since this post and had the ultrasound report from 2/28/10 sent to my main OB/GYN. They too have moved my due date from 10/4/10 to 9/23/10 based on the ultrasound performed on 2/28/10. I've been seeing a specialist as well and they have all decided to go by 9/23/10, which makes me 25 weeks, 2 days today. Even though my period did not start until 12/25/09 and not 12/17/09 (based on the 2 week window period) are they now basing it off of the baby's fetal age and not the myth that I ovulated 14 days after I had my period?
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replied June 12th, 2010
Especially eHealthy
Serra, That will mean that you ovulated/conceived on new year's eve, Dec 31. Sex between around Dec 27 and Jan 1 made you pregnant.

That will mean that Mr #1 is the father of your baby. Of course only a paternity test can determine for sure.

Take care.
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replied July 4th, 2010
HI Serra.....If you conceived on the 1st that means you ovulated as soon as your period ended? I know that they say this is possible, but I find it hard to believe. I myself am in a similar situation. I think that ultrasound dating can be off by a week in the first trimester and then two weeks after 11 weeks of pregnancy. My doctor changed my due date because of ultrasound dating and it only varied by 4 days. I think it should have remained with my LMP. What do you measure in fundal height?
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replied July 5th, 2010
I did not get measurements on any of my ultrasounds; only the gestational age. From what I've heard, the accuracy of an ultrasound between weeks 7 and 14 are only off by no more than 3 days. Of course, there's always room for error.


As far as ovulating as soon as I had a period, this happened with my first child, who is nearly 5 years old now. Every woman's body is different; and nothing is really "textbook" when it comes to ovulation. I'm pretty sure I ovulated somewhere between days 6 and 9 of my cycle.
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replied August 5th, 2010
Im no expert but if u r sure on ur cycles and they really are that short...then everything should be a ok and guy 1 is the father....the 10th would be a conception date for someone with a more regular cycles for ur given lmp,
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replied September 27th, 2010
Well apparently they are very short. I had the baby on 9/22 and it's very apparent that it's man #1's child. The ultrasound at 10 weeks was spot-on.
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replied September 27th, 2010
Thats awesome that your u/s was spot on at 10 weeks...that gives me full confidence in my situation which is somewhat like urs but I didnt even have sex with one of the guys and I had a 12 week u/s.
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replied September 27th, 2010
Especially eHealthy
cartwheel cartwheel Congratulations with the new baby Serra!
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replied October 8th, 2010
Thank you, Susan. Smile
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replied February 3rd, 2011
hi my name is jessica
i hadtwo sex partners one was june 27,28,29 2010 and the other one was june 30 - july 18 2010. my period came july 19 and ended july 23. i had unprotected sex july 24,30,31 and august 1 2010. my period didn't come august 16... sept.21 i had and ultrasound which said i was 9 weeks 4 days pregnant. oct 14. i had another ultra sound that said i was 13 weeks and 2 days. my last ultrasound was dec. 9 2010 and i was 20 weeks and 3 days. did i get pregnant by guy #1 or guy #2 please help me my baby is due april 25, 2011
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replied February 3rd, 2011
Hi Jessica,

I hope i can help you.
If i look at the dates i think its more likely you got pregnant anywhere between july 29th and august 2nd (if you have an accurate cycle).
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replied February 3rd, 2011
candycane255- thanks i rather for it to be guy number 2 i do have a accurate cycle which was july 19, 2010. are you saying a paternity test wouldn't be needed ? will this be 100% i got pregnant july 29- august 2 ?? i just would hate for guy number 1 to be the father !!
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replied February 4th, 2011
Hi Jessica,

Your ovulation is usually on the 14th/15th day of your cycle and your fertile for about 6 days before your ovulation. Which means starting from day 9/10 to day 14/15 will be the best chance for you to get pregnant. (day 15 if you have a late ovulation).
If you add these days starting from july 19th it is most likely that you got pregnant between july 29th and august 2nd.

SO looking at the days you had sex i would guess you got pregnant either on the 30th, 31st or 1st of august.

If its a girl it's probably the earlier date since the x chromosoom (for a girl) takes a longer time to reach the egg. For a boy it would probably be the later date since Y chromosoom is faster...

If i look at the date the gyno gave you on sept 21st it is pretty correct. If i count back i land on july 16th.
But there can be a difference of give or take 3 days... so its actually pretty spot on to the date you started your last period.

I hope this helps a bit and that it is the guy you want it to be...
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replied February 4th, 2011
candycane255,

i think i'm confused a little are you saying by you counting back you landed on july 16 that i could have got pregnant before then ? sorry if i'm confusing you i just want to make sure i understand what you saying.. if it's the guy i want it to be will a parternity test come out to be his ? and i'm having a boy.
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replied February 4th, 2011
Hi jessica.

Im sorry if im confusing you.
Please dont forget that with a 40 week pregnancy you get 2 weeks for free. Your actually only 38 weeks pregnant, which means you must have gotten pregnant between 29th and august 2nd.

They count from the first day of your last period, so if the gyno tells you that you are 9 weeks pregnant, the baby is ACTUALLY only 7 weeks old.

(if you would have gotten pregnant from the cycle before, they would definitely have seen this on the dating scan.The difference is just to large.. )

I personally dont think you need paternity test. You can not get your period if you are already pregnant..
As long as it was a normal period that took as long as 3 to 5 days with normal blood flow it was a period and NOT spotting. PLUS they would have seen this on the ultra sound.

Scans between 7 and 14 weeks are the most accurate because baby's grow at the same rate during this time.
It will only have a difference of give or take 3 days.

I hope this helps you a bit. and sorry again for confusing you.
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replied February 4th, 2011
Oh and congratulations that you are having a boy thats awesome Smile
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