I am 29 years old female and breastfeeding? Nowadays I feel shortness of breath and elevate in pulse rate 120 during resting mostly during morning but that doesn’t stay long and goes at normal by the evening. I had done ECG, ECO and TMT 5 months back due to other problem. fortunately reports were normal. what could be other reason of increase in pulse rate and shortness in breath? should I visit doctor in this case?