Found a cockroach in my new apartment.?

We've been here about a month and until today had no suspicions that there were cockroaches. It was a big one.. like 2 inches big. Killed the damn thing though. Is it possible there is just one? I'm absolutely freaking out that the place could have more. It looked like an American Cockroach.. if that makes any difference. I'm afraid to use any sort of poisons.. sticky pads.. anything like that as I do have pets that get into everything and I do mean everything... Anything you guys can recommend to help me figure out if there's more and get rid of them that won't be hazardous to my pets?