Confused on when I conceived

krystyn04

So.. My first missed period was July 1st. I I remembered my period starting early may between may 1st-May 11. But I don't remember having a period in June at all. My first ultrasound calculated my conception date at June 9th. The one I got when I was 19 weeks calculated it to be June 21 putting my due date at March 14. Is there a way to figure out my exact conception date? Could the doctors be wrong on how far along I am by a whole month since I really doubt I had a period in June?

taahira

It is only a difference of 11 days from the 9th to the 21st. What does it matter either way?