Had unprotected sex on 2nd day of period and took Plan B about 32 hours later (mostly for peace of mind - I guess). Period stopped that day and getting thick discharge now.

What is happening inside the uterus at this time? Does Plan B have any effect when taken during a period? Since my period stopped, I want to know whether Plan B is just stimulating my uterus to keep the lining and not flush out an unfertilized egg, but will be flushed out after the effects of the hormone Plan B utilizes have worn off?