I'm 34 weeks and a few days and for the last 2 weeks I'll get this racing/pounding heart and tightness in my chest. It mostly happens when I'm lying down, doesn't matter if I'm flat, propped up, on either side, or on my back. When it happens I sit up and try to breathe through it, but then panic sets in which doesn't help. My Dr wants me to get an ECO test and wear a heart monitor, but I just wanted to see if this is fairly common?