Just thought I'd share my experience in case any of you go through a similar thing. Wish I had known this was possible/realistic. As I was leaving the hospital, the nurses were clear that if I had a large blood clot, I should call immediately. About 6 days after birth, I was standing and a gigantic clot came rushing out of me and onto the ground. It was about the size of a plum and scared the sh*t out of me! Called the doctor, who wasn't too concerned so long as I wasn't soaking a pad an hour other than that one time. Though I had images of hemorrhaging in my bedroom, turns out all was well-- as the dr had said, it was a clot that had stuck to the uterus and not been expelled during birth.
Anyway, just thought the story may come in handy in case anyone else is in tears thinking they're about to die. Granted, please call your doctor (of course), but know that it really may be benign.
Re: Huge blood clot