When I change the dose of any of my psych meds, the cycle gets affected typically spotting depending on the dose adjustment and depending on the pill. I can predict this like clockwork. I have also found this with the anti-seizure medications, that I take for other reasons but the same things happen. The BC pills are affected by the psych meds and vice versa. It is frustrating, even when the pill is taken like clockwork. I was warned about this by both my pdoc and OBGYN. Sometimes going to a different kind of pill can help offset this some, but changing bc pills cange cause a need to change doses of psych meds. It can be a vicious cycle, pun in tended.Talk to your doctor. Stress though has a potent affect on the body too and cannot be discounted, even when on the pill. Take good care.