 [ Symptoms ] i have had my period three times in the last month and am on birth control could this be natural or should i be worried the cycle does not follow my normal cycle normally it lasts only a few days and is light through this is lasts 6 8 days at a time and is often very heavy [ Disease ] not necessarily worried but certainly concerned not all birth control pills are the same one size does not fit all you may just need an adjustment in your dosage basically a different pill so you will not be annoyed by this breakthrough bleeding call your medical provider