Hi I Just Finish My Workout And Took A New

Hi I just finish my workout and took a new preworkout. I've seen I before in my pee but not as much. It was all over my boxer not sure if it started before my workout or after. I know that when got to the gym had to pee real bad but I didn't notice if any blood was there. I held my pee for about 20 min then had to run to the washroom to pee while I was hold my penis since I'm not sure if it because of me squeezing my penis. I'm a little scared and not sure why and what I should do, I have no pain anywhere not even in my pens please help me and direct me in what I should do. The you Wesley