Is this normal?

Today I brought out a spin bike from the group ex room for my workout. I tried to stay in the aero position the majority of the time. After about 30 minutes, I sat up and noticed my dick had fell asleep. It felt numb. At first, I was a little scared, but after a few seconds the feeling came back- thank god. I was wearing under armor shorts and tights, which could have played a role in blood constriction. Has this happened to you guys or is this something I should be worried about. Numb dick is a weird feeling.