How can you tell how far along in pregnancy a cat is?

Week 3: Your pregnant cat's nipples will start to become enlarged and pinkish in color. Her belly will not show any signs of swelling at this point.

Week 4: Her belly will now start to show a slight swelling. The swelling of her nipples will start to be more evident. Her appetite will start to increase.

Week 5: Some cat experts recommend that you consult your vet for a "growth formula" to satisfy your pregnant cat's accelerated appetite.

Week 6: Your cat's pregnancy will become obvious at this point. Cat pregnancy symptoms will now include behavioral changes. The pregnant cat will now start to move around with more care. She'll avoid stretching and twisting actions, and if she usually goes outside, now she'll probably want to stay inside. Her appetite continues to increase through the sixth week.

Week 7: The greatest sign of cat pregnancy is now your cat's behavior. You should see a noticeable change in behavior as she starts to show some signs of excitement. This is also called the "quickening" stage of cat pregnancy as the fetuses start to move. She'll roll and stretch and start to search for a spot to give birth. This is another good reason to keep your pregnant cat inside so that she doesn't make a nest outside.

Day 61: Labor can start as early as 61 days after conception and as late as 70 days.

I've had a pregnant cat before and right now my cat is currently pregnant.

So the above are all very true signs of cat pregnancy.