Involuntary semen release while running?

Tonight I was on a run and about a mile in I went to “adjust” myself and rather than the normal slick sweat I’m used to I was met with a slimy, sticky substance. Now, I know what cum feels like on my fingers and it didn’t feel like that, but could it have changed texture when it mixed with the sweat? The thing is I didn’t even feel anything coming out of my penis during the run so I genuinely don’t know if it’s just sweat or if I actually came in my pants while running.