So, I'm on birth control and have been for about six months so my periods have been pretty regular, I start my period on the fourth day of the last week of my pills, which are the placebo and I usually have minimual cramping with a moderate to heavy flow. This month, I'm cramping pretty badly and the bleeding is very very light. I can't even use a tampon. Anyone else have this problem? This has never happened to me before. I don't think it's a concern for a doctor visit.. But I'd figure id get more opinions.