Conception//pregnancy timing ??
Can someone explain why pregnancy is dated from the last period instead of the actual day conception happens?
Like(using these dates for an example)
if my last period started April 28 but conception would’ve happened around May 15, doctors would still say I’m already over 3 weeks pregnant by May 20 even though fertilization only happened about 5 days ago. I don’t fully understand how that dating system works.
Like WHYY does it count as the last period and not the conception?
And when we are shown photos of babies/fetus at certain weeks.. are those from the pregnancy count or from the conception?? Like when they go "this is a 3 week old fetus"
I know stupid a$$ questions but I always wondered this.