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Hi Scot,
First off, ultrasound dating is an ESTIMATE. Going by her LMP (since she knows it) is usually more accurate and it is what doctors use to predict due dates.
With her LMP staring on Dec 10, she'd normally be expected to ovulate between Dec 21 and Dec 26. The egg is viable for about 48 hours. Sperm is viable for up to about 5 days. You did have sex when there was a possibility for her to get pregnant.
BUT the timing is off. She should be showing 38 weeks and 5 days. She's off by a month.
Get a DNA test.
Good luck.
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I am struggling with my conception date well more worried than anything else. My lpm was 15th Feb. My 1st scan said edd 20th Nov and other 2 scans confirmed 19th November - sounds good. My doctors seem to be going by my US results EDD 19th Nov. According to my LMP the EDD is 22nd Nov 2015 though. Had intercourse on 21nd or 22nd can't remember unprotected with my husband (came inside) and then on March 6th with someone else (with protection - no accidents reported, apologies for being so graphic: I examined myself and there was no remains of sperm inside me only the usual condom oily feel and odour - I assumed all is good and condom did its job) so (long story short, we separated with my hubbie for few days - couple troubles) Just to put it out there this was the only 2 times I had IC one unprotected and one with condom. According to all the calculations including my lmp and US my conception should be around 26th Feb - 1st March so nowhere near 6th March. And to mention I had MC last Sep so my cycles were little all over the shop but before pretty 28 days +/- couple days due to stress in work etc. Please help when was I likely to conceive.My midwife said around end of Feb beginning of March - I really think its my husbands baby. PLEASE HELP/ADVISE. Maria x
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There are just too many variables to say with 100% certainty.
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22nd November is your due date based on your LMP. That's how most doctors calculate your due date. Take your LMP and add 40 weeks.
Don't rely on the US for a due date - it's an estimate. They're close enough.
Unfortunately we can't know exactly when you ovulated, nobody can, after the fact. Going by the averages your husband should be the father, almost 100%. It is unlikely to be "someone else" again based on averages.
Hope it helps.
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