Spotting between periods. Mismatched cycle?

alex

I have been on this birth control for 3 years and recently started spotting more and more about a week before my period is supposed to start.

I'm thinking it's because my natural cycle is closer to 32 days not 28 and maybe forcing my body into a different cycle has started messing with it.

Does anyone have any experience with this? Or ideas of what else it might be?