I have asthma & became pregnant w/twins 3 1/2 years ago. Before becoming pregnant, I was taking Advair (inhaler) & Singulair (pill), but when I became pregnant, my doctor switched me from Advair to Pulmicort b/c at the time Advair was not 100% proven to not be harmful to pregnant women. I was fine until I started getting really big, which on my 5' frame & being pregnant w/twins was already an ordeal for my body on top of having asthma. I would sometimes get bouts of breathlessness so I would try to not overexert myself, always carry my rescue inhaler, arching my back to try to expand my lungs helped & when I slept, I slept more elavated than recommeded for pregnant women to reduce pressure on my lungs/chest. Overall, having asthma while pregnant wasn't too bad, just don't forgt to take your meds b/c when you are pregnant the term "pregnancy brain" is true, so if you forget, take it as soon as you remember, keep your rescue inhaler close & relax until you feel the wheeziness or breathlessness go away. BTW, I'm still on Pulmicort b/c my dr. figured, why switch if it's working & I'm also on Spiriva, another inhaler that's supposed to work w/your current asthma medication, but I'm no longer taking Singulair (pill). Hope this has helped & good luck to you!