Observation post 3 months of covid: My SPO2 varies between 94-99. Especially when I take deep breath, it goes 99. Else, it varies between 94-98. I do 6 min walk test everyday and it remains constant at 97-98. When taking rest , sometimes it goes to 94 with hand being bent at elbow, on straightening it goes 98. Possible reasons for this fluctuations? No cough, very little chest pain at times.