"I can't even put my shoes on without feeling like I ran a block!" — missy0828

What it is: Difficulty breathing after normal, everyday physical activity — or even while sitting still.

What causes it: Early on, pregnancy hormones affect respiration and blood flow, leaving you short of breath. Later in pregnancy, your growing uterus limits room for your lungs to expand.

When it starts & ends: Shortness of breath tends to start in the second trimester.  As your belly grows, your breathlessness can too.

"I find myself short of breath just sitting on the couch, and I do Crossfit five times a week!" — jackalv

What to do about it: Rest when you need to. Get regular exercise, but don't overdo it. Stand up straight. Sleep on your left side.

When to talk to the doctor: Talk to your practitioner if you have asthma or if you're constantly gasping for air. Call the doctor ASAP if you have chest pain and rapid pulse, or if your lips or fingertips start to look blue.