okay so let me explain... I just started taking micrgestin 1/20 more than a month and a half ago and before that i was taking loestrin 24fe but had to switch because it got discontinued.. anyways i believe i had breakthrough bleeding for almost two weeks during my active pills... just yesterday it stopped and I had unprotected sex with my boyfriend and he came inside of me. I began the first day of my placebo pills today and I am worried about pregnancy... I haven't gotten my period and I don't believe I wont this week because I had breakthrough bleeding... is pregnancy a possibility since I had unprotected sex yesterday and I started my placebo pills today and dont have my period? or should I take plan b to be safe? please answer and thank you!