I take birth control almost religiously however I accidentally missed almost 4 pills in a row at the beginning of the month of pills. Last night I had unprotected sex (I had taken bc that morning and hadn't missed since the 4 I missed the beginning of the month) and my boyfriend came inside me. Our drugstores were closed so I had to wait until this morning to go buy Plan B but took my bc on my way out this morning out of routine. Is taking Plan B ineffective because I already took my BC after having sex? What is the percentage of plan B's effectiveness at this point?