I started ortho tri-cyclen on May 23rd because I have irregular period. I haven't had my period since January & I was put on the pill to regulate my period cycle. I just reached the first pill where I'm suppose to get my period. I'm sexually active & do not use condom. I started getting cramps for a short period since last week, but no signs of my period starting. Could this mean that I'm pregnant? Or something else is wrong?