No, the female cat will not mate until she is pregnant successfully. Male cats always want to mate, whether the female cat is really worthy or not.

A cat's estrus can last five to ten days at a time. If you are not pregnant, you can estrus again within two to three weeks after the end of estrus.

Cats in estrus are not limited to mating once, but also mating many times to get multiple chances of pregnancy. Because cats are stressed to ovulate, that is to say, they don't regularly and quantitatively expel eggs like people, but expel mature eggs under strong stimulation during mating, so they may be pregnant every time they mate. It is not necessarily unique for a female cat to have multiple cubs at a time.

Father's offspring will be very different in color, posture and even variety.

It is normal to be in estrus after mating, because even if an egg is fertilized successfully, it needs to be mated as long as it is still in estrus. If it doesn't estrus again after this estrus, it may be pregnant, if it doesn't succeed.