Pregnant or pregnancy scare?

On nov. 3 we did anal and I always cover myself but without thinking I covered myself with my hand that had his pre-ejaculation on it. He had peed several times before but accidentally poked around the vaginal opening but hadn’t ejaculated. On nov, 6 I had a hydration test and had to pee in a cup, I noticed white flakes in it and that’s when I got worried. On nov. 8 I started to start metronidazole and I started getting cramping in my uterus, nausea, headaches, and a metallic taste in my mouth. The nausea, headache, and metallic taste are all side effects of the medicine. Cramping in the abdomen is normal but not uterus. They’re almost just like period cramps but I don’t start my period until nov. 19. My boobs have been sore since around the 10th I want to say. I had a dream about telling my mom I was pregnant the other night and now last night had a dream about the test but it was never taken