I'm almost 16 now, and I recently had intercourse with my boyfriend. During, he noticed I was bleeding. I wasn't on my period, and haven't had a period in a while. I've noticed my uterus is swelled, and it has an odor. I've been too uncomfortable to tell my mom about this, but I'm worried it might be an STD or worse. I've only had a few times unprotected sex, and all others were protected. Can anyone help me figure out what is wrong?