Most inhaled asthma medications are safe to continue during pregnancy. It is very important for you to maintain your health and ability to breathe so that the baby can be healthy. The general thought is that your ability to breathe well is more important than any risk the meds may pose to the baby (which are very low).
You should follow-up with your doctors to make sure that you are on an apropriate treatment plan at thist time.
you might want to ask your doctor for sure. im 15 weeks and on albuterol inhaler and when my doctor brough up my asthma to me at my last appointment she told me not being able to breath is more of a risk to my baby than taking my albuterol. id assume the same is true for you.
if they dont think that inhaler is safe for you or baby anymore, maybe they can switch you to something to use during the pregnancy that will help you breathe.