The Trial Work Period
The Trial Work Period (TWP) is designed to allow SSDI recipients to experiment with working while still receiving their full monthly benefit. It consists of a total of nine months, not necessarily consecutive, over a 60-month period. During these nine months, a person may earn an unlimited amount without lowering their monthly cash benefit. The TWP was developed many years ago to encourage disability recipients to go back to work when they can.
A TWP month is triggered whenever an individual earns more than $770 per month or when a self-employed individual (that is, business owner, freelancer, consultant, etc.) works 80 hours in a month.

You are well below $770 per month so should be absolutely fine. But you could contact social security directly to make certain.