A.C.
I can almost guarantee that they are fungus gnats. The primarily feed on decomposing organic material in the soil and may nibble on plant roots IF populations are high. The best defense is to ensure that the soil is not staying too moist. They have a short life cycle and will peter out in a few weeks. Empty any water out of saucers and water thoroughly but infrequently. Let soil dry out quite a bit and then then water completely.