Hello, today I crashed my drone for first time 
into a small branch. Nothing really happened but the propeller chipped. Is it suggested to get it replaced?
Great question. If you have a chipped (in any way) propellor it certainly can affect the performance of the drone. It is recommended to change the propeller when this happens. You only need to change the damaged one (even in the slightest) as it can effect the maneuverability and stableness of the craft.
Heya @aechavar. Glad to hear the damage was minimal.
Here’s an article all about props and when to replace them. I hope that helps!