So, I am and have been on microgestin for a few (5?) months now. Ever since i started taking the b/c i have had very irregular periods. Last month I had my period on my 3rd week of active pills and didnt have my period during my inactive week of pills. I started a new pack 6 days ago and 2 days ago had unprotected sex. My boyfriend and I are worried that i might be able to get pregnant so I was thinking of taking plan B just to make sure. Do i need to? And if I do, would i still take my b/c with it or skip it for today?