I take contraceptive pills and havent started the inactive pills, yet have had light bleeding and cramps after using the bathroom tonight

Oral bcp: The bcp's used today are very low dose, so any irregular taking of the active pill (even as little as a few hour difference from the day previous' time) may cause slight withdrawal bleeding. This is mostly just inconvenient, but next cycle, try taking them in the evening, within the same hour as the evening prior. Repeat light bleeding suggests trying another type of low dose bcp.