how do you know when your cat is really pregnant?

Really sure............

when the kittens come out

Your cat will first come into season (heat) somewhere between four months and twelve months and can become pregnant with the first mating.

The first noticeable sign of pregnancy in a cat is a change in her nipples. Approximately three weeks after mating her nipples will become pinker and more enlarged. This is called 'Pinking'

Your cat may become more affectionate and want more of your attention.

There may be an increase in appetite.

Pregnancy can be confirmed by your vet from approximately 22 days using ultrasound.

As the pregnancy advances your cat may begin 'nesting' behaviour. She may begin searching for a place to deliver her kittens. She will try to get into closets, cupboards and other secluded places.

You cannot tell for the first 3-4 weeks. If this is not a top quality purebred show cat, she should be spayed now. No excuse for her to be pregnant.

you can't tell after a few weeks.

First look at her nipples. They should be swollen. If you touch her belly you should be able to feel the kittens. Of course her belly will grow to sides and she will be lethargic mostly sticking around the house.

if after they go in heat there stomachs grow harder and bigger and there nipples grow also other than that theres no other way to tell til there born or not unless u take it to the vet.