Burning painful sex???

My fiancé and I just had sex last night after a 2 month dry spell of nothing. It felt like I turned into a virgin again except it was burning really bad. I'm 32 weeks so far and though we haven't had much sex throughout this whole pregnancy, it has never burned this bad! It felt extra tight too, if that makes any sense. Has anyone ever had this before and is it something I should be worried about??