Cats can reproduce very quickly too. This is another reason to have your male cat fixed asap. If your female cat is pregnant she could easily become pregnant again before you have a chance to get her spayed. I know this from experience. When I was about 8 years old we had a female cat and we let her have kittens. We planned on getting her spayed after that but before we knew it she was pregnant again. Your male cat will also be less likely to run away and to get into cat fights if he does get outside. Good luck.