On the 23rd I had gotten off my period. I took Plan B One-Step the 24th (because of unprotected sex). Today I woke up at 4:30 a.m to abdominal pain and spotting. I went back to bed and woke up at 10 to a flow as if I went back on my period. I know it can make your period early and late but I don't know if it's possible to have your period 5 days after taking it.. Can someone please explain to me what's going on???