So my boyfriend and I had sex in the 30th of January and he came inside me on accident. ( We talked about things the night before and he planned to do them when we met without telling me ). We were able to get the plan B but not until almost 20 hours later ( the next day ) and this app says I was supposed to start my period on the 6th but I haven't gotten it ? I've gotten mild cramping but no bleeding? Maybe it's off? The app has been off before about my cycle. I've also been taking anti anxiety meds so would that do something to the plan B and not make it effective? Any answers would really help