birth control
"I've been on this pill for about 5 years now and I have to say it is amazing.  One thing I will note is that before I first started using birth control I had very regular periods, I strictly went on the pill for extra protection when I went into college.  After starting the pill my periods became less heavy, and they became some what irregular as the years went on.  The first year on the pill I would have a very very light period each month BUT as the years went on I would get my period every 2-3 months.  As of now this is the 5th month that I have not got my period, I am not pregnant but it is very odd to go this long without a period.  Most woman would like that but I like knowing that I would get my period every month or so."