The most important consideration during pregnancy, for you and your baby, is to work with your doctor to achieve optimum control of your asthma. The good news is that the consensus of medical experts regarding the use of the commonly used inhalants for the control of asthma, inhaled long-acting bronchodilators and inhaled steroids, is that they are safe for both mother and child. However, you should definitely discuss this question with your asthma and pregnancy doctors.
Good luck to both of you.
Using inhaler wouldn't be a bad option at all, since no other medicine is recommended during pregnancy. As inhaler directly shoots the medicine into the lungs for earliest revival, For better usage & understanding of inhaler, would recommended you to get in touch with a lungs & chest specialist for more.