Low grade fever

La

100.2 is considered a low grade fever, correct? I know 100.4 is technically the threshold for a fever but that’s pretty damn close and LO is clearly sick with something. Trying to figure out if it’s worth a trip to the doc or if the will wtite it off as “not a fever.” Any thoughts? This is the start of day four and he also has congestion/coughing/greenish mucous.