sometimes there are thick white strands kinda looking like worms in the placenta ... I think that's probably what you are seeing. But if you are really concerned, post a picture for us.
If there are lumps of fat (white-ish, kinda chunky, sortof looks a bit like cauliflower, ranging from the size of your thumb nail to the size of your thumb) being discharged from the vagina, that is a sign that the uterus has ruptured. In the case of a rupture, the doe needs to be put on heavy antibiotics, and if she survives, given a good long rest before breeding again, or even retired from breeding. But if they survive I've had them breed again after a long break. If she is a top show doe or has sentimental value, you can even consider having the vet open her up and repair the rupture.
BUT, I think its just the placenta that you are seeing. A picture would help me be sure.
Congrats on your new little one and hope mum goes okay!