I was recently given a penicillin shot for a sore throat. They told me I could continue taking my birth control & shouldn't affect anything. The next 8 days I bled a lot with cramps, period like symptoms even though I had been taking my birth control religiously. My boyfriend & I had sex in this time & he ejaculated in me about 3 times, I was very worried about possible pregnancy so I took a morning after pill VERY close to the 72 hour cut off.. I'm no longer bleeding when I take my pill, just barely any spotting. Is there a possibility that I could get pregnant still..?