I’m 36 weeks pregnant and for the last 2 weeks I have been experiencing random periods of increased heart rate (about 110bpm). My blood pressure is still normal as I test at home due to history of preeclampsia. While it’s happening I feel a bit short of breath and faint. Should I be concerned or is this normal part of late pregnancy? It can happen at anytime- not just after activity, I could have been resting on the couch for the last hour and it will suddenly happen, and in no particular position.