Conception date

[nicole1114]

So, I had my second ultrasound today. The due date she gave me today is Oct 3, 2014 which would put me at 9 weeks. The original due date I was given was Sept 29, 2014. Which would have put me at 9 weeks 3 days. I know the earliest is the most accurate. The doctor told me today my conception date was most likely Jan 5. Last time she had told me Jan 6. The date of my last period was Dec 27, 2013. Can someone help me determine if I should take Jan 5-6 as likely conception dates, over January 10th which is what I receive when I do an online conception calculator.

[AnnieBrooke]

Sounds like good advice.  :)

[nicole1114]

Because I had to go back today for a free ultrasound because there is a nurse who needs practice, and I had volunteered. And I brought up my concern about it possibly not being my boyfriends, and she went over the information with me again, and the information from today's ultrasound and said to stick with the January 6th conception date, and that it is most likely his and not to worry but when the baby is born to get a paternity test if i have any worries.

[nicole1114]

Well, the exact weeks would be 9 weeks 1 day that's what she gave me. And my most accurate due date would be Sept 29th. She also said my probable date of conception was January 6th, and to stick with that and most likely it is my boyfriend's baby.

[ChristineM117]

I would go by your first one, I would trust your ultrasound over the conception calculator, even if you did ovulate on the 10th sperm can live in you up to five days! That's just what I read

[AnnieBrooke]

Did they say, "You are [number] weeks pregnant" when they did the first ultrasound, and did it line up exactly with the 9 weeks 3 days or 9 weeks 0 days figure you mentioned from the second ultrasound?

[nicole1114]

The sex in question took place on Jan 10th. And my first ultrasound was 2 weeks ago.

[AnnieBrooke]

It sounds like you feel the difference between an estimate of September 29 and one of October 3 is going to be definitive.  I'm sorry, but there is no way to determine who is the father if the men are only a few days apart and the sex was at the time you ovulated.  If they were that close together (that you feel like the difference of only 4 days will give you an answer), both of them could have had viable sperm in your system at the same time.  

The ovulation date I get from your February 24 ultrasound is a window beginning on the 6th but lasting several days.  When was the sex in question?  When in your pregnancy (in weeks along) was your first ultrasound?