My husband and I had sex the 13 of this month and I knew he came inside me was to late to run to the store so I did so right in the AM next day took this Plan B ASAP .. I’m suppose to have my period the 28 and I am a day late on my period I have cramps and back pain as if my period was coming but no bleeding what so ever I did discharge a bit yesterday just nervous in if this pill didn’t work my first time taking this pill ..