Could I be Pregnant...Please help!!!!?

Me and my bf have been seeing each other only on the weekends. When we have sex it hurts on the outside of the vigina and when my bf pushes up it hurts really bad like sandpaper. Wetness isnt a problem and we don't have and STD'S, After when I go to the bathroom it hurts really bad a burning feeling and I want to cry. This is fairly recent. I swell only after I have sex then I'm fine. Can anyone help.