Pain after sex

I'm wondering if anyone has the same problem as me. After sex (regardless if he has finished inside me or pulled out) I find I'm rather tender and stinging, burn when urinating (just a little) and I feel a little out of place down there. I feel the stinging the most if we try to go again but once we're going again it no longer hurts. Lubrication is not an issue (at all) and I'm beginning to wonder if is a sperm allergy (don't use condoms, just the pill) and if anyone else has these same issues. Everything feels amazing during sex but after it just hurts a little and it's starting to bother me.