I'm 35.3 Weeks Pregnant I'm Dilated At A 2 And

I'm 35.3 weeks pregnant I'm dilated at a 2 and 50% effaced as of yesterday in L&D. I was put on 20mg of procardia every six hours. I was not put on bed rest and if I move around to much I start having contractions again while on procardia. But even while I'm sitting I'm getting very sharp stinging pains in my vagina what could this be from?