UTI or something else?? HELP

Hey everyone! Last week, I had a strange stinging pain immediately after sex. When I went to pee, it burned a little, and I noticed the discomfort was on the side of my labia. I thought it might be irritation from friction, possibly due to a lack of lubrication, so I bought something to soothe it, and that helped a bit.

Today, after a week off from sex due to a fever and the lingering pain, my boyfriend and I tried again. When we started, it stung on the sides during insertion. About 20 pumps in, I felt the pain again, but this time it was more on the top rim of my vaginal opening. Afterward, it burned when I peed, so I hopped in the shower and rinsed with hot water, which helped relieve it. I applied some vaginal cream afterward, and the pain isn’t terrible, but it’s still there.

It’s not an STI—I got tested, and so did my boyfriend. Could it be friction, or maybe a UTI? I don’t have any stomach pain, though, so I’m not sure.