Hi, I am almost 20 years old. I have been on the birth control Yaz for nearly 5 years now. I usually have pretty regular periods, but my flow is usually decently heavy. Recently i was supposed to have my period on the 24th of November and it did not arrive till around the 26th. However, when i did get it it was very light, and a very dark brown color. I had all of the usual symptoms of my period. I do have sex but we always use condoms. Now that it is over i am still getting severe cramping. I am not sure if i may start my regular period or if i could be pregnant. I took 2 pregnancy tests and both came back negative. If anyone has any ideas of what could be wrong let me know!