I am not sure why you posted in the men's sexual health forum. This will probably be moved to the Am I pregnant? forum.

If you have been having unprotected sex then you could be pregnant. All you can do is take a test. It should be accurate if your period is already late.

If you are a female, then of course you could be pregnant. That's where babies come from after all. The only way you can know for sure is to take a pregnancy test. If you don't want to become pregnant, either use protection or don't have sex. The pull out method is not at all reliable.