About 2 weeks ago my boyfriend and I had unprotected sex. Unfortunately on that same day I was moving and didn't remember to take my birth control until 4 hours later. The next morning I was feeling abdominal cramps and out of fear that I could be pregnant, I resorted to taking Plan B One Step about 28 hours later. I am still cramping and should of started my period a few days ago, but I have not. Could the possibility of the cramps and not starting my period be from throwing so many hormones into my body, or could I have been too late with taking the Plan B?