Ultrasounds in the first trimester are accurate to within a few days. Maybe your confusion comes from the fact that weeks of pregnancy count from the last period, whereas conception took place at ovulation two weeks later.
Maybe that’s what the issue is. Idk I just feel so confused. I’m 26 weeks now but had my u.s at 7 and 8 weeks and they both came back correct. It must just be in my head
Correct. You got pregnant from sex in the last week of July and might have got a positive home test the middle of August. If you have a regular 28 day monthly cycle your last normal period would have been in the middle of July.