Hi, I just recently stopped my birth control, ortho evra, which I was on for 2 years. I got my period every 3 months by my choice because I get really bad cramps when I do have it. I took my patch off on January 13th, got my period January 16th until the 21st. I am married and have unprotected sex. I was supposed to get my period around the 13th or 14th and still haven t gotten it. I ve taken many at home pregnancy tests the 13th, 14th, and 15th, and all were negative. What could be the cause of my missed period? Is it possible I am pregnant?