Weird red mucus

Hey guys, so I recently just started having sex again after my 3 year break up. The first time I experienced light spotting then it stopped after a day. I had my period a few days later, then I waited a day after it was off and had sex again. This time when I had sex, he was more rough. I'm experiencing light spotting but it's mucuscy (if that's a word) and also I'm experiencing UTI symptoms such as it stinging a bit when I use the restroom. Has this happened to anyone? It's been going on for 3 days now. Someone please tell me I'm not alone!