How early did you find out you were pregnant?

Li

I had my 8 week apt today where my doctor updated my expected due date based on the ultrasound. I was previously given the due date of 6/14/21 based off of my last period, but he says his best guess based off of the ultrasound is 6/20/21.

What surprises me about this is I had a VERY clear BFP on 10/8 where I would’ve been only 3 weeks and 4 days pregnant which is so early to find out. Has this happened to anyone else?