Sex help

So me and my husband generally use condoms, but when we don’t my vagina hurts after sex. He will usually finish in me when we dont use condoms (i have the arm implant). I dont really know how to explain the pain, i guess its kinda like a burning pain and feels almost like inflammed or something. I originally was worried that just not enough lube or that i was allergic to his semen but he has finished inside and pull out to completely finish outside of me on my skin and that doesnt leave a rash. So anyone else experience this? Or know what it could be?