Scans are pretty accurate. If it says 7 weeks most likely you are 7. I'm having my dating scan today too and I suspect I may be less than I calculated as I have irregular periods. It's ok, you'll get to the end of it dear, even if it means 1 extra week
I always go by the date rom the ultrasound based on baby's measurements.
Baby #1 LMP put me at June 9, 2009, ultrasound date June 17, born June 19
Baby #2 LMP put me at March 22, 2011, ultrasound date April 6, born April 4
I have not had an ultrasound yet for #3, but when I do I will go by the date they give me as it seems I ovulate way late in my cycles. So far ultrasound date has been pretty close for dating my previous 2 pregnancies.
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