Reem - for me, the baby's heartbeat had stopped by my u/s at 8 weeks. I waited 2 more weeks to miscarry, but had no bleeding at all. Since I had a hemorrhage after my first delivery, they didn't want to give me cervadil/misoprostal (a medical abortion), but rather a D&C (a surgical abortion). At 10 weeks, I had the D&C. My beta hCG levels had gone all the way up to about 64,000 (iirc). It took about 9 weeks for my beta to drop to zero. (After that, I didn't ovulate, so they gave me Provera to start my cycle again.) I did NOT wait an extra cycle. I started my next FET on that first period, about 11 weeks after the D&C.
Lou - I really hope I can carry a singleton to term, or at least a little further along. I hate that I've gotten pregnant with twins twice and lost them both times. I think that if (when!) I carry a singleton to term, it'll just make me so much angrier about losing both sets of twins. If we didn't have to do the IVF, we would probably never have had twins once, let alone twice. Twinning is a negative side effect of the IVF, which is the only way for me to get pregnant. It's hard to think that if I carry a singleton to term, it would mean that it was only the twinning that made me lose those 4 babies, and that it was the hated IVF that made them all twins....