Can ultra sounds b off by a month or more than 3 or 4 weeks. I had an ultra done at 9w and 4d. I'm due Aug 19 2012. And I had sex wit my current boy friend on Nov 26 2011. But I also had sex wit an old friend when me and my current boy friend broke up in Oct around the 30. Can't really remember exactly what day. But it was around the end of Oct. I had a period in Nov. Jus wanna make sure that it is my current boyfriend cause he has been there for me the entire time.
Ultra sounds are usually right on point for measuring and determining how far along the baby is! The only time it would be of is if the baby isn't developing on point in which the doctor would tell you if the baby is not developing on point! As far as determining who is the father in all reality a DNA test is the only for sure way to determin if you had unprotected sex with one or more people!
On a side note: for the fact you had your period after you had sex with the first man most likely he is not the father!
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