My resting heart rate is 57 bpm, ( im 31 yrs old, 5 7 145 lbs female, not overweight but havent worked out in years, I lack muscle mass). Does this indicate low blood pressure or anemia? I do get light headed if I stand up too fast, I havent been tired at bedtime hrs, usually doing fall asleep easily and today i feel a short of pressure on the right side of my cheat, which is why I checked my heart rate. I also wonder if I may be pregnant, although my great rate should be in the 80s if its at all like my previous pregnancy.