Pregnancy increases mucous production, so if you have summer allergies, they're liable to be worse right now. "There’s always at least one woman in every childbirth class who has trouble with the breathing exercises because of that," says Morris. "Breathing in through the nose and out through the mouth sometimes just isn’t happening." Over-the-counter allergy meds haven’t been proven completely safe for pregnant women, so deciding whether your symptoms are worth the risk is a call your doctor can help you make. Meanwhile, do your best to avoid any triggers. For example, if you’re allergic to dust, invest in an air purifier or a vacuum with a HEPA filter. To open up nasal passages, try an over-the-counter saline nasal spray, a neti pot or night-time nasal strips. Dr. Harms also suggests doing light exercise to reduce nasal inflammation.