I used to have extremely bad cramps with my period, and I would bleed very very heavily for all 7 days. This is why I am now on bc (yasmine) for a little over a year now. It has helped so much, I hardly cramp now. But my period doesnt start until like the 4th day of my placebo pills, and is so light and lasts just two or three days. I knew it would get lighter, but I just want to make sure the huge change is alright.