Reason For Pain And Bleeding After Having Sex?

My boyfriend told me this morning that yesterday he had discharge yesterday and again this morning. We have been seeing each other almost two months with unprotected sex. I usually discharge as it is nothing out of the ordinary for me. As we both have had std in the past, we both think it s not std. But....lately i have been having pain in my stomach and bleeding after sex. I do have a iud so that is also normal at times. It s now confusing and scarry now that he has said something. I have noticed when i give him oral sex first thing in the morning, he has hard crust build up at the tip but i took it as pre ejaculation. This has Been about two weeks now.