Hi it could be anxiety that can make you feel short of breath, or if it is a hot day that can make feel short of breath. Or if your inside the house with the heating on that can make you short of breath because it drys you chest out. If it was asthma it would show up in your oxygen levels. And you would need sprays, sometimes if i spray to much deodorant that makes me feel short of breath.If you are are worried then i would go see your doctor and ask them for a chest x-ray because that will tell you if there is something wrong.