My boyfriend and I had unprotected sex Wednesday. I took a Plan B pill the next day. I was scheduled to get my period Saturday but still haven t gotten it, but I ve heard that the pill may delay it. Saturday morning I woke up feeling very sore. I have some cramps, both my right and left side of my stomach(near my rib cage) hurt/feel achy. Is this a normal I did trip down the stairs Friday night but I landed on my back so I m not sure if I feel achy because of the after pill or my accident.