Help! My cat had a stillborn kitten and hasn't had any more kittens since.

I have no idea what I can do. My cat had her first pregnancy and is now giving birth around 12h, Like, she had a single dead kitten that she completely ignored before she stopped having contractions, she just spent the whole afternoon asking for affection and now she's sleeping under the bed. She has eaten a few times, drunk water, and showed no difficulty in using the box, but I'm very worried because it's also my first time having a pregnant cat and I have no idea what to do, I know she'll probably have more and I'm starting to despair