Well first off, if you don't want to become pregnant, USE BIRTH CONTROL.
You can go to your local planned parenthood or family planning, anything, and get free condoms, you can even buy them for a few dollars at walmart, it's easy, there is absolutely no reason for you not to use condoms, especially if you don't want to become pregnant.
I also wanted to say, the "pull out method" is not a method. When you have sex, the man gets excited and releases fluid called "pre-ejaculate" and he can't even feel it, and it contains sperm, and can/will get you pregnant.
You can get pregnant anytime during your cycle, but the most common time is 14 days before your next period. Wait until your next period comes (or doesn't come) and take a pregnancy test.
and what about the pills? did you go to the doctor and get on birth control? I'm assuming that's what you meant by the pills. If you take them everyday around the same time, like you're supposed to, you should be fine. That means you're protecting yourself, so if you're on the pill, then you are most likely not pregnant.
good luck, keep us updated.