I had a bleed at the 6\7 week mark too, no clots just two very red fresh blood bleeds. There wasn't alot but enough to freak me out. It can the be embedding in the unterus wall (apparently). If you really cant wait until the scan (I dont think I could) you can go to your Dr and just have a blood test done that checks a hormone level or something... it's pretty accurate. Someone else will know what I mean and might be a bit more specific.
Good luck hun, I hope all is ok in there. My sis in law bled copious amounts for about 6weeks and her bub is still there and ok amazingly.
Big :hugs: