My period is irregular. now didn't get one during my "no pill" week of bc. had small light brown discharge for 2 days, days later, didn't miss pills?

Could be BC: Hormonal BC can alter your cycle dramatically. Some women may not get a period at all while others may have a very short period. That being said, there are other reasons you might not be getting a period, schedule an appointment with your OBGYN so they can rule out other reasons for the missed periods. If it is just the BC they could switch you to a lower dose pill.