My hamster fell! Will he be okay?

I was showing my mom my hamster, and I held it up to her, but it tried to get out of my hands and fell. It fell on it's back, and it kind of tensed up and squeaked and peed. I scooped it up and but it back in the tub where I was playing with it (his name is Elmo by the way) and put it on a blanket. It stumbled around, but then it started running around normally, so I put it back in it's cage and it ran around on it's wheel for a bit. I fed it a small piece of apple, it gladly took it and gobbled it down, it washed itself, and now it's just sitting in it's cage. Will it be okay?