Can someone help?

I may be over reacting but around the 16th of September I was ovulating. I had sex with someone with a condom and he stuck it in raw like 2 times. Recently I also had to get antibiotics and IV fluids for a kidney problem. My period has been 4 days late. Does anyone know if taking antibiotics makes your period delay? Or if having a uti could possibly delay it? And when should I be worried if I'm pregnant? Thanks, xoxo