What is it?

Hey everyone! So in June, I started seeing someone new (we're now exclusive). We talked and we were both cleared of any STIs and STDs and use sex without a condom. Recently I began to get an itch down there. It was so strong one night it woke me up. I had a lot of discharge (which I just assumed was from the heat) but took UTI medication just in case. The itch was almost gone (just little itches here and there) after treatment. Last night, my boyfriend and I had rough, quick sex (without a condom) and after we put our clothes back on and went out. When I came back home I saw 3 small, light, faded blood spots. I then woke up this morning to use the bathroom and when I wiped I saw a light drop. I'm worried he hasn't been tested soon before we got intimate and he may have passed an Sti. Or is it just inflamed down there? Is it just an itch and the blood was spotting during birth control or from going rough and quick? I know no one here can officially diagnose. I am going to my gyn on Monday but I am wondering if anyone has had a similar issue or has any suggestions.