How does that work, positive then negative. What sort of signs do you have for a clotting disorder when not pregnant? My sac stopped growing at 6 weeks 5 days but I was nearly 9 weeks when I went for a scan. There was nothing in the sacs, but the first twin m/c I had there was nothing in the 2nd sac, but a heart beating away in the 2nd, which we lost 10 days later. I actually had bleeding in the sac, it was horrible the way they described it, they actually thought I had a molar pregnancy. Well that is what every scan indicated but then upon testing the cystic mass as they called it, luckily enuf it wasn't a molar pregnancy - phew!!!!