hi. Im 33 wks pregnant , and for the last 6 hrs I ve been experiencing tightness in my chest, sudden pressure that comes and goes on my right side bellow the rib cage, shortness of breath, and a rapid and strong pulse that i can feel in my neck and chest. I dont have high blood pressure . Is this something i should worry about? Also, the heartbeat and shortness of bed get worse when i lay down.