Hi, I am a 21 year old female. I am 5' 8" and wiegh 218 lbs. I have been takeing CNA classes for the past week, so we have been learning about heart rates and blood pressure, and reperations. My teacher has drawn it to my attention that My heart rate runs a bit high. So I have been checking it everyday. I keep getting the same read, about 112 Beats per minute. When should I start to become concerned, and possibly see a Doctor?