FIRST TIME SCARED OUT OF MY MIND

I had sex with my partner on Sunday evening. It was my first time ever, however things just happened and he didn't use a condom. He pulled out because he came on me, and he also peed about 15 minutes prior (not sure if that matters or not). I'm just nervous that something could go wrong as I am not ready to be pregnant. I feel like I am making myself sick thinking about it, I have this pit in my stomach. My next period isn't expected for another 11 days