Girlie i'm going through the same situation. I had protected sex using a condom. I am 22 years old i did it with one of my best friends that i went to middle and high school with. I had sex with him may 2008 sometime before mothers day. And i had 2 periods since then i was suppose to start my 3rd period on the 28th of july. I ended my 2nd on july 1st or sec. And i still haven't started mine. It is about 6 days late. I'm kind of worried and i am scared to see a positive result so i haven't bought a test. A few days before i was suppose to start i had period cramps sharp pains in the upper part of the vagina area. And i still haven't got mine. It could be many reasons for me. I am stressed, worrying about paying bills, worrying for the past three months if i could be. But i already had two normal periods and i could see if they weren't normal then i would have something to worry about. Also there is a known fact that if you are constantly around women like a mother, sister or friend. Sooner or later you and one or more of them women will end up having their period around the same time which would also throw you off. And can be very confusing. But back to my story.... Since i had sex i haven't experienced any pregnant syptoms besides pain in my lower abdomin. But that could be the cause of my period coming on. Your chances are very low sweetheart that your pregnant. But 1% is 1% and that can get you pregnant. Maybe this won't have you worrying to much. Its hard to talk to your parents so talk to a friend or your doctor. But sooner or later the truth will be seen if you are. My advice don't stress and watch for symptoms and keep record of body changes. Hope i helped alittle. Write back and let me know if your pregnant or not.