Should I get checked out if my O2 drops below 90 when I’m walking? I walked to the bathroom at work and checked it when I got there it was at 77 and slowly when up to 92. When I’m resting it’s anywhere from 94-99.  Usually if it stays around low I’ll get checked out but right now it’s all over the place. I do have shortness of breath however it’s not unusual for me. And I’m just getting over a cold. 