So I had sex one day after my period ended, literally one day after; had unprotected sex, but took Plan B One Step about 5 to 6 hours after it happened, he did come in me. It has been over 12 hours i have taken the pill now, and I am having really bad back pain and light cramps.. I read some reviews on another website, some say that there are 2 pills that should be taken. I really hope im not pregnant. Can someone help me out please. Im very worried.