Heartbeat beating fast

I am currently in 13 wks + @ 2nd trimester. Lately I noticed that my heartbeat is racing/pounding. Makes me cough and I have to catch my breath sometimes. It also happened when I first had to take my blood pressure. I just came out from the toilet and had to walk a bit to the clinic when the nurse called me. The reading was 143 (I was shocked cos I am anemiac and normally I have low bp) and my obgyn had me re-do the bp again cos she said it's not good. Anyone facing the same? What do you do?