I did not believe I was pregnant when I had gone in for my physical. My boyfriend and I use condoms every time so when she said congrats your pregnant I said no and demanded a ultrasound because I had my "period" a week before. I'm 14 weeks pregnant now and I had my last one at 12 weeks
I'm 4 weeks and really want to get one ASAP just to make sure everything is okay
It depends on your doc usually they'll do a dating ultrasound around 8-12 weeks to confirm how far along you are and set an estimated due date
A lot of doctors do it at different times, my first one was at 9 weeks I believe