I Was Prescribed Nitrofurnation (macrobid ) To Protect And Prevent

I was prescribed nitrofurnation (macrobid ) to protect and prevent a urinary track infection due to being on Diflucan for a dermalogical rash on the outside of the vagina . When I went to the hospital (last night ) I was not experiencing any vaginal discharge and now after taking two Diflucan and the doze of macrobid I am having vaginal discharge ..is this normal or should I go back to the hospital ?