Pilot observed two spherical shaped objects flying in formation below aircraft

I am an FAA licensed private pilot. On June 26th, 2022 I was flying with my girlfriend from Sioux Falls, SD (KFSD) to Fargo, ND (KFAR). Roughly an hour and twenty minutes into the flight, I looked out the left side of the aircraft and observed two spherical shaped objects flying in formation below and to the left of my aircraft. The objects were either reflecting light or glowing white in color. At first I figured they were other aircraft, however we were only flying at 3,000ft MSL and the objects appeared roughly 500ft below us. At this altitude and in my experience aircraft and birds are easily distinguishable. I highly doubt that they were drones because I do not think I would have been able to see them, nor would I expect them to reflect light. As I continued to watch the objects they made a coordinated right hand turn (from the perspective of the objects) and soon disappeared from my sight. I made mention of these objects while I was watching them to my girlfriend, who claims she did not see them at first but did see them before they disappeared.
The time and location provided is an estimation, but in the general area.