Yesterday for about 20 minutes me and my friends were in an underground parking garage skating a little bit. We realized that it was closed off because of something being wrong, not just construction, so we left. it wasnt even close to 20 minutes, it may have only been less than 10, but should i be worried? (Im 17, a guy, and i dont want to tell my parents stuff i dont have to). I dont feel sick, i know symptoms can take a while to form but i dont think anything is wrong so...do i have anything to worry about?