How would you know if water went behind the iPhone 6 home button?

I was getting out the shower I went to turn my music off and a bit of water off my arm landed on the home button I wiped it off insanity how do I know if it's gone inside the iPhone?

I'm sure your fine as long as your not having technical issues, I have a 6+ and have done this at least 20 times with absolutely no issues so I wouldn't worry about it.

You are probably fine, I doubt if its a big deal unless alot was on it