What Are The Effects After Microgyon?

Been on the microgynon birth control pill for 6 months now, and i have been on my sevon day break and it was normal, i am now in the middle of the pack, and i have got a brown discharge at first, the next day there was blood but it is light, and now it is just blood, and its like my normal period, this has been going on for approx. 5 days, im seeing a doctor tomorrow but want some information first..