Welcome to a very large club. If you play with guns long enough you will eventually have an ooops moment. The trick is to not repeat it. Those who have not had an ooops moment just haven't had one yet or aren't admitting it.
My ooops moment came when my brother handed me an empty 45 and I did not check it. There is a 45 caliber hole in my carpet next to my bed because I pushed the slide home and pulled the trigger prior to putting the gun away. Only force of habit making me keep the muzzle down and away from my feet to a blank spot on the floor prevented anything exciting happening. Thank heaven for deep pile carpet, only I know where the hole is and I ain't telling.