Can a astma inhaler affect the result of a pregrancy test?

NO effect =preg test. Asthma inhalers have no effect on pregnancy tests mainly because they deliver medication locally --to the lungs. A urine pregnancy test measures a hormone (b-hcg) that comes directly from the placenta.
No. The ingredients in asthma inhalers are not known to interfere with the results of pregnancy tests. If you are concerned or you are having difficulty reading a home pregnancy, see your doctor. They will be glad to help.