Ive been on Yaz birth control for only 2 and a half months.. My first 2 periods on yaz were very light, but i did have cramping.. Now im in my 3rd pack and about a week and a half into the pack ive been cramping and my lower back and legs have been kind of aching. Its not horrible aching or anything but it's making me nervous. Is there anything wrong with cramping this early? Its been going on for almost a week now. My boyfriend and I have had sex and its worrying me. Can anyone please help?? Im just not sure if this is normal or not.. :-(

Thank you!