i was suppose to get my period on 7/15/17, i had sex the day before he ejaculated inside me so the next morning i took plan b. then later that night i got my period as i expected it was very light and the first two days i really didn't bleed at all. the third day it was normal flow. its now 7/26/17 and i'm still bleeding and cramping which i barely cramp. my period usually lasts between 3-5 days sometimes 7 but that's rarely. so it is really weird it's lasted this long. is it because of plan b?