I had a doe that I thought aborted at 100 days gestation.... she had blood dripping for a day and a half.... never found a fetus though. She just delivered a healthy set of twins at 147 days gestation..... don't know what happened.
I have a doe who started bleeding during her last pregnancy and I thought she aborted. When she started making an udder I decided she hadn't or at least hadn't lost all the fetuses. She went on to deliver twin bucklings. I did find the cause of the bleeding though. The buck I had in with her was horned. It seems he would come up under her and hooked his horn on her vulva and tore it. He also tore a large gash in her udder. The bucks horns were tipped at this time to prevent it from happening again. Sadly we lost the buck to the dreaded meningeal worm last year.