Pregnant Cat Bleeding, But No Babies Over 12 Hours Later?

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She was probably a very young mother (I had a cat come to us in the same shape 6 months ago) She probably does still have 1+ kittens in her which NEED to come out or the will rot inside her and become poisonous to her (just like if we are rotten meat, except she cant just through them up since they are not in her stomach). Go ahead and sleep- she will be fine for several hours (and if she is not, there is probably nothing you could have done being awake anyway). Really do try to get her to the vet in the next couple days though...
Also, she is wanting attention, but resting and not coming because she is tired and sore... labor is rough on a body-human or cat. she wants comforting, but doesn't want to move too much because it hurts(which is normal).

Good luck