Plan B

So me and my boyfriend had sex the day after my last period and the condom broke. I took Plan B within the first 12 hours. Since that had we've fooled around without protection but have never had intercourse for a long time ( like he when inside for like two thrusts but pulled out and put a conform on). Obviously I know that was stupid to do. Right now, according to eve I'm 3 days late. I was suppose to have my period Friday and it's Monday. I'm having abdominal pains like cramps but more sharp and painful. Could my late period be a result of the plan B? 🙁 because I'm starting to get freaked out.