8cm I was guessing was babies length thats how I got 13-14wks on this apps baby info. Srry if u ment something else. I am 13wks so I jus looked at my baby info n it said baby is 6-7cm n 14wks is 8-9 cm
Chart I checked said somewhere between 8 and 9 weeks from the first day of the previous period. Different than the other poster said.
Ask the doctor, and if you want to know specifically when you might have conceived (versus the dating of the pregnancy the medical way, which comes from the first day of your last period) say you are interested in the conception date not the gestational age.
On the baby info 8cm would b 13-14wks, how come ur dr didnt say?