So I was in the 6th grade when I had my first period. Then I didn't have one again until I was a freshman in high school and it was out of control then. They put me on the pill and I have been on the pill since then. I am now 21 years old and I haven't been on the pill for 3 months. My last period was in October and that was when I finished my last pack. I noticed that I only have a period when I take the pill and when I've stop I don't... what is going on?