I'd say ur body is trying to get ur period back on track. Doesn't sounds like pregnancy to me. Good luck.

I had my periods after about a week late than usual when I had the first intercourse of my life. Maybe its the same case with you too. From what you have mentioned, it seems higly unlikely that you can be pregnant. However, if still your problem persists, I would advise you to go and get a pregnancy testing kit that is available in all general medical stores.

I'm not trying to tell you what to do or how to live your life, but being older than you and having the benefit of hindsight, I would say, reevaluate your decision to become sexually active. That's good that you used a condom, as stds are no laughing matter. Women are much more susceptible to getting one than are men. But pregnancy, especially an unwanted pregnancy is really, really sad. That's not what you want for your life. When you make a baby, you want you and your partner to be ecstatic, not worried sick. It is o.K. To just have guys as friends. Why should you provide sex? Really, once you get serious, engaged or married, that can be a wonderful part of the picture, but you are young, and why not focus on other things like hanging out with friends, guys and girls, going to school, working, exercising, hobbies, etc. At least I would say, wait until you are 18, the age of consent. Just value yourself enough to know that if you are not wanting a baby at this time, with this guy, either don't have sex with him or find a birth control that will not produce unwanted side effects , and then keep insisting on the condom, mandatory! Good luck to you. Not trying to sound preachy, just wish I had spent my youth differently.