Help I need to find out when my cat got pregnant?

My cat is really pregnant and I don't know when she is going to give birth. Does anyone know how to find the approximate date of conception?

Well, did she accidently slip out the door? Can you estimate when she MIGHT have gotten pregnant? It is usually 65 days but can vary from 58 to almost 70 depending on the cat.

If you feel them moving then it is probably close to that time

You have her strictly indoors I hope and indoors until the kittens are 10 or so weeks old and they can all be spayed?