I had my 7 week scan today and all appears normal. Baby's heart beat was 136 bpm. The ultrasound person told me I'm only 6 weeks pregnant but my GP says 7. I'd prefer to be 7 because there's less weeks until the end of the first trimester. I don't understand if you take the date of your last period and count each week after that it works out 7.

has this happened to anyone else?

thanks,