So I know the day I ovulated, so do I go off of that day how many weeks pregnant I am or my LMP? I did ovulate a week late than normal

I know the doctors go off first day of last period, but why not your ovulation day if you know when?

Cuz according to my ovulation day I’d be 5 weeks but if I go off when my last period was then I’d be 8 weeks. I did get faint positive 12-13 days after I ovulated tho