Questionable sign of pregnancy?

I've heard that having a higher heart rate can be a sign of pregnancy since it would be circulating to yourself and your baby. What is the normal resting heart rate and the normal resting heart rate of a pregnant woman? (I really hope this isn't a stupid question because I just haven't heard much about this.) I checked my heart rate and I was about 100 heart beats a minute. I'm about 5'7 and normally 110-115 lbs.