possible infection or just have a cold

I got the copper IUD right after I got an abortion. This was two weeks ago and my boyfriend and I waited the amount of time the doctor said in order to have sex. We waited a week and in that time I was still bleeding a decent amount and when we had sex my vagina felt almost numb in a way and it hurt when he went in too far. I understand the part that it would hurt and haven't really paid any attention to the numbing part because both of those things have disappeared and now sex is wonderful again. What I don't understand is that I still have minor cramps off and on, even after two weeks. And now I'm very very achy, not feverish (I think). I do have a really bad sore throat so I'm assuming I just got sick and I'm worried about the uterine infection that could possibly happen with an IUD and abortion. Maybe others have experienced and infection before and can tell me not to worry or to immediately go to the doctors. Any thoughts? Any reassurance that could tell me I'm just sick hahaha