I took birth control for a month so far and got my period on the second day of the placebo pill. I've been on my period for five days now, and I'm not sure for how long it's supposed to last. I started my second pack of birth control today (Sunday) even though I'm not entirely done with my period, and I'm not 100% sure if that's okay or even allowed. My gynecologist wasn't clear on the instructions, help?