I had an emergency scan last week following a bleed. Luckily all was ok and I was dated at exactly 9 weeks (which fits in with the date I ovulated - was tracking using a Clearblue fertility monitor). Today I had my booked dating scan, exactly 7 days later, and I was showing as 9 weeks 5 days. The ultrasound technician didn't seem fazed but it just seems odd to be two days off... Has this happened to anyone else? Could it be slightly off or is it pretty accurate? The scan quality was average/poor and it took a while to get a crown-rump shot. Any advice gratefully received! X