vagina

So I don't know weather or not to go to the doctor or not. My vagina will just start to hurt during the day happens all time if the day when it does happen it hurts when I pee and then when I walk sit and etc. I haven't found anything that really pops out at me that "triggers it". This doesn't happen like everyday but it does probably one every like two to three weeks. It might stay there for a day or two.  I have the IUD as a birth control.  Thanks in advance