Aigoo, asthma during pregnancy memang tricky ya, few of my mum friends went through this and they all ended up consulting their doctor/respiratory specialist early because it's important to manage it properly for baby's oxygen supply. Most of them continued their preventer inhalers (which are generally safe) tapi kena check dengan doctor mana yang aman untuk pregnant moms, especially if they were considering switching medications. The worry is legit tapi don't stress, many pregnancies with well-controlled asthma go smoothly, just need proper medical supervision from the start. Definitely reach out to your gynae and ask for a referral to a respiratory doc if needed, okay?