Dont get worried inhalers acts directly in airways thr by prevents sideeffects, thr is 0 side effects of inhalers tht tooo during pregnancy it is the only good treatment. Asthalin acts only for 2to 4 hrs u may need long acting dosage inhalers as days go u may require high dose to be in control and thr wont be any side effects in higher doses also.
Next Steps
wash your mouth after using your inhaler, send a pic of ur pulmonary function test fr pvt consult.