If an ultrasound says 9 weeks but it s been 7 weeks to the day since we had sex is that just a margin of error or is it simply not mine?
- Katherine WLv 77 months ago
It's yours, buddy. They date the ultrasound to her last period, not to the day she had sex.
This is where you consider why you're not using condoms if you don't want children.
- MissALv 77 months ago
Pregnancies are dated from the last menstrual period, which is usually about two weeks before the baby making sex. This is a hangover from the era when ultrasound wasn’t available, although in practice it means that you were two weeks “pregnant” even before fertilization
- Tri-HarderLv 77 months ago
Gestation is conception plus two weeks. If she conceived seven weeks ago, the ultrasound would say she's nine weeks pregnant.
- SnowFlakeLv 77 months ago
Pregnancy is counted from first day of last period not day of sex. I am nervous that you are pregnant and don't know how to works
- How do you think about the answers? You can sign in to vote the answer.
- PippinLv 77 months ago
Pregnancies are dated from the first day of the last period, NOT from when she had sex.
And if her cycles are fairly 'average' (28 days give or take a couple) she would have ovulated about 2 weeks after the first day of her last period. So the dates are dead-on.
- EttaLv 47 months ago
Probably not yours - ultrasound can be a week early or later but if sex was 7 weeks ago she would only be around 5 weeks pregnant if she conceived the day of sex as it takes the egg almost 2 weeks to get to the womb and implant there and would not yet show on an ultrasound. Would have to be at least 6 weeks pregnant to see a dot on the ultrasound and impossible if sex was only 7 weeks ago