Exactly how far along am I?

Ang

I have 3 different apps on my phone stating I am 12+5/6. I had my first OB exam on 12/16 and accidentally gave 10/9 as my LMP (it was really 10/6...oops). My EDD was determined to be 7/17/20.

I had my 1st ultrasound scan yesterday and CRL measured 12+6 however the EDD given by my Dr really puts me at 11+6 according to their report. I’m trying to understand exactly how far along I am to determine when I’ll officially be in the 2nd trimester.

2nd pregnancy (lost our first at 7+4 in Sept) so making this far feels like amazing accomplishment. I’m too scared to celebrate despite having found out the gender yesterday! Immediate family knows but we haven’t disclosed our happy news to anyone else - even to my close circle of friends who we’ve seen every other weekend for football parties lately!

Any insight would be awesome :)