Good luck with it all Serendipity! I had my scan last week - I thought it was 7 weeks, but it turned out to be only 5wks 6days. The equipment they use makes a difference sometimes too...not all ultrasound machines and accessories are as sensitive as others. I could just see the fetal pole which was only 2.4mm...apparently many machines can't pick up something so small at all...I know it's hard not to stress though...