Endometriosis
"I was put on this pill to hold endometriosis at bay. 7 weeks into taking the pill I got my period. It has been 9 days so far at the regular flow of my period. On my old pills, I was lucky enough to only get a period every 2 or 3 months. 



I am going to switch. At least on my old pills I know when I was getting my period."