saph is there any chance you could have a scan sooner?
i am pretty sure after 6 wks your levels start going all over the place and not doing what there suppose to like doubling and stuff, thats why they usually do scans rather then bts after 6wks

if your 6 wks 3 days you should be able to see a sac and a heart beat hopefully. so if i were you just to give you piece of mind i would ask to bring the scan forward and have it sooner

will be thinking of you, let me know how you get on ok xxx