I had sex for the first time on June 9th; my partner said he was clean, and so we didn't use a condom (he didn't even bring one otherwise I would have gotten one myself, but we were already in action by the time I realized and I was too nervous to tell him I didn’t want to do anything without one) and I took a Plan B afterwards just to be safe. In that time afterwards, I had stomach pain and diarrhea, which I believe is normal for women after taking it. Anyway, I started my period a few days ago with some pretty rough cramping, but I was glad I got it because it meant I wasn't pregnant. Now my period is ending, but there is extreme irritation and itching of my vaginal entrance. The skin flaps around it are swollen, and it causes discomfort when sitting. I worry that it is an STD of some sort or an infection, like a UTI or a yeast infection, but I don't have pain when I pee and I don't have any discharge or foul odors. It’s just reaaaaaaallly itchy and I’m worried about what it could be. I don’t have medical insurance right now as my parents kicked me from theirs when I turned 18, and I don’t know a way to set an appointment otherwise, so asking this forum is the only thing I could think of.