I can't give you an amount about the blood loss, except to say that blood loss is usually greater after a twin birth. Before my twin birth, I was taking floradix, chlorophyll, extra alfalfa, Slow-Fe, eating well, and had a very good hemoglobin # in the safe range. I still had a LOT of bleeding, almost worrisome enough for a transport, had two IM shots of pitocin and one IV shot of pitocin, and was on methergine for a few days.
Congrats on the twins. There's a parenting multiples forum on MDC that can provide some information as well. It's not exactly as natural as some of the other parts of MDC, particularly with regard to birth issues, but it's a little more crunchy than the mainstream, for sure!
Wife of one and mom of five, including my HBAC twins!