This isn't a baby issue, you need to see a doctor ASAP. If you have an inhaler, take it. I double checked and Albuterol, at least, is just fine while pregnant. But as my midwife said, it's better to take your inhaler and be able to breath than worry about it and have a massive asthma attack.
If you don't have an inhaler, do as PP suggested and get to the ER or Urgent Care ASAP. As someone who has had a massive asthma attack because I didn't want to go to the ER, it can get bad fast.