My doctor predicted I was around 7 weeks at my first ultrasound. The baby was 9.9mm is that size typically the begining or end of week 7?
I'm not sure if this is a repost or not so I will answer it just to make sure that your question gets answered. It's hard to say that it's a beginning or ending size. I would say that if you had the ultrasound, you can consider that the middle of the week so if you are trying to calculate the pregnancy delivery date, you can ballpark it from that. Does that help?