D.B.
Welcome to Mamapedia, Michelle.
I had never heard of a C-section scar pregnancy, but I looked it up (not sure of the validity of some of the sites). From what I read, in an incredibly small percentage of pregnancies, the gestational sac can attach to the fibrous scar left in the uterus from one or more prior C-sections. So I gather that the issue is, can the pregnancy obtain enough nutrients in a sustainable way over the many months of gestation. Is that your understanding?
Have you talked to your doctor about a second consultation with a high risk pregnancy specialist, ideally someone with familiarity with this issue?
There are many of us on Mamapedia who have struggled with fertility issues, so we understand your fear and panic. It's hard to think straight, especially if you don't have any answers. What's clear is that the stress makes it worse, and having bleeding makes it worse still. From what I read (not an in-depth study by any means), some of these cases resolved and some did not end well. It's probably way too soon to know what the future is for this pregnancy. Please ask your doctor to refer you to some reliable specialists and perhaps an experienced counselor or support group. Your situation is so rare, there may not be local resources, but perhaps there are on-line support groups? There's also a long-time organization called Resolve which deals with various aspects of fertility issues, so you might see if there is a local chapter. These women could possibly be great resources for you.
Good luck!