Hi, I can't figure out why I haven't had my period since April I have never been late like this.. I'm 25 years old and last had unprotected sex march 20th and have had two periods since then and took a test from the dollar store just to be certain even though I had two periods.. I'm not on birth control and cannot figure out and reason as to why its late since I'm obviously not pregnant.. I'm not sure what to do..