I dropped my iphone 4 in water and it works?

This morning while I was getting ready for school and I dropped my iphone in the toilet! But luckily retrieved it after half a second or second. I immediately tapped all the water out with the nearest towel and shook it out for 5 mins. I even googled things on it, and it was working perfectly. (later i found out you're not supposed to do that) And since I didn't have rice, I left it in couscous for 8 hours. I just came back home and everything is working fine, like perfectly. Will it start messing up in a few days? And should I take it to get fixed right now even though it looks like there isn't anything wrong at the moment?

My brother dropped his iphone in the toilet 4 times. After 3yrs, It's still working.

Luck of the draw. Some get it ruined, some don't. As long as it works I would just be happy and not worry about it.