What Causes Vaginal Bleeding After Having Protected Sex?

Hi there. I had sex with a guy yesterday and I m not sure if he was clean or not but we used a condom. And after that my vagina, the hole really started stinging bad it was so painful. After that my tummy started hurting and this morning I went too pee and little stringy bits of clumpy blood started coming out. I just got treated for a urine infection and I m taking the thrush indicators at the moment and I m on the ginet 88 so what could it be?