Was looking north observing an airplane coming from east to west at approx 25,000-30,000ft, 75° above elevation, surrounded by objects

They initially appeared to be a flock of geese much higher than the airplane, spread out in a horizontal, semi straight line. Within 2-3 seconds, enough time to get my binoculars, there were 5 or 6 round, oval object directly over and under the airplane. As they swarmed around the plane and it's contrail, they went from being dark and colorless, undefined in shape, to bright white, round and oval shaped. I began to look for neighbors who could witness this with me, biggest mistake of my life.. because they were gone when I looked back in their direction. Please tell me that I'm not the only one who seen this.