Slight burning sensation.

Sarah

I have a quick question, so I'm ttc and when I have sex (this has been all of my life) and the guy cums inside me after a few moments or so it starts to burn not a lot not enough to where Im in pain but slightly. I thought maybe I'm allergic to the acidity. Or maybe allergic all together but I'm really nervous that this is going to make it difficult for me to conceive. So if anyone else experiences this or knows what it is please help me cause idk what's happening when I was younger I didn't think much of it but now that I'm trying to conceive I'm afraid there might be an issue.