Birth Control

I may need to switch to a new brand of birth control pill.

I started taking Kariva (a generic form of Mircette) at eighteen to help regulate my period. After starting I began getting my period every month, as opposed to once every couple months, and was fairly satisfied with the results.

The only negative thing I have noticed with Kariva is that although my period does come every month, my start date is almost always different from one cycle to the next. For example, I might get my period on the 22nd day one cycle and the next cycle it might start on the 24th. This wasn't really an issue the first two and a half years I was on the pill, since I wasn't sexually active. But now that I am, for my own mental sanity I'd appreciate a pill that could keep my start date regular.

Does anyone else have any experience with this issue, or have a pill that seems to work pretty well at regulating their start date? I'm very careful about taking my pill everyday at the same time, so that's not the issue. I really hope this issue can be resolved; each month I start my period late brings me a little bit closer to having a mental breakdown.