There is a centipede in my room... help?

A few minutes ago I saw a HUGE freaking centipede (or so I think..) crawl up my wall. My room is clean so I have no idea why it is in here...or how it got in here in the first place. I have animals and they go outside so they have fleas, so just a few hours ago my dad sprayed this spray on the floor that kills fleas... anyway, I googled it and it looked like a house centipede, and I loathe bugs so I'm freaking out. It fell off of my wall and I don't know where it is. If it ever turns up again, how can I get rid of it?