Asthma and pregnancy

Hello!
I returned to the forum after several years away. Glad to be back!
I am sixth months pregnant. Combined with weather changes (mainly cold, dry air), after a quiet period, asthma is starting to show up again and is gradually getting worse. I have been increasing my symbicort dose, according to my pulmonologist's advice; it helps but some symptoms are still there, especially after exercise or other physical effort.
I am a little worried because of the fast rate of progression, compared with usual pre-pregnancy winters. I hope it doesn't get too severe by the time I give birth. Do you guys have any tips?