"i&#039;ve been prescribed this birth control since my 6 week checkup february 14th but i didn&#039;t start taking pills until march 12th after sexual intercourse, but i wasn&#039;t taking them everyday like i should. my period still came on a couple days early and was regular but i have cramps even after my period. a couple of days ago april 8th i started taking the pills everyday and the cramping are starting to decrease but i have headaches and my stomach bubbled up like i had diarrhea &amp; i felt nauseous at one point ."