Did i make a mistake?

Hi all. Today I feel like I did something really dumb. There was a racing competition and although I heard all the warnings about not running during pregnancy I ran 100 meters sprinting. I felt fine. I even come out first amongst the other ladies. I've always loved sprinting and that was my favorite sport But I haven't ran in over a year. now at 5 months pregnant I regret why I did that. My uterus kinda hurts but not that bad. I'm just worried that I hurt my baby. Some people say I'll be okay and some looked at me as if I was a complete idiot. I'm even afraid to tell my SO that I sprinted because I'm worried about the pain. Also my baby isn't moving right now as he always is when I'm resting. Or maybe im too conscious of it??? Please help