I haven't commented on any of your posts but have been silently stalking for a while. I bled for several weeks with my second. It started around the time AF was due and carried on for several weeks. Sometimes there was just a bit when I wiped, sometimes I needed to wear a pad. Sometimes it was brown and sometimes bright red. But I now have a healthy 8 year old who came to no harm at all from it. The doctors never discovered what caused it and it eventually stopped on its own.
Try to stay calm and go to the emergency room. They will check you over and probably send you for a scan. Just keep in mind that you are still really early and if they do send you for a scan they may not see much and it is too early for a heartbeat etc, so don't panic if you can't see much. With your history it is natural that you are going to worry and think the worse, but there are a lot of people out there sending prayers and positive thoughts your way and hopefully all will turn out to be ok. But if you don't go to the doctor you are going to torment yourself with worry.