For the past 4 weeks i find that it's getting harder to breathe when I take deep inhales of air. It feels like there isn't enough room in my lungs. It basically results in extreme coughing fits where I'm trying to catch my breath. The same thing happens when I laugh too much, climb a buch of stairs, or yawn deep. I told the doctor at my last visit and he said its normal because my diaphragm is moving up but these coughing fits are pretty bad. I'm in my 18th week. Has anyone else experienced this? I don't have asthma.