Help am i pregnant?

Girls today is my 30th day of cycle and I havnt got any periods yet. Yesterday i only had mild spotting and i feel cramps like thoes you get just before you are about to get your period. I was expecting my pad to be full but there is not even a single drop of blood now. And i dont feel cramping anymore. I didnt use any birth control or contraceptives only the withdrawl method. Please tell me am i pregnant?!