First thing would be to head down to the chemist and grab yourself a pregnancy test kit. They usually have two in a box so you can double check the result if you are still not sure.

If it comes back positive, go and see a doctor who will be able to confirm the result for you.

Is the withdrawal method the only type of contraception you are using? It is not very reliable at all, and trust me you can never rely on men to "pull out" at the right time! The pre-cum on the end of his penis even before intercourse is enough to get your pregnant. Use protection!!!

Hope everything works out for you.

Like savannah said, the withdrawal method is not very reliable. You should probably make an appointment w/ the doctor, and in the mean time, go to your local drug store and purchase a home pregnancy test.

Your doctor can #1--administer urine and blood tests to determine if you are indeed pregnant, #2--talk with you about contraception, safe sex, pregnancy, etc., and #3--prescribe you birth control pills.

Since you're very late, and have other symptoms of pregnancy, I would suspect that you are, but there is no way to be completely positive until you go to the doctor and get a blood test done. You know, even if you aren't pregnant, the absence of your period is very odd and should be addressed by a doctor anyways.
Good luck.