Well maybe you feel like you aren't in good shape but sounds like your heart may be.......lucky lucky......
and im not in good shape lolll
I defimately wouldn't worry about it if your doc isn't . Remember pro althletes like Lance Armstrongs resting heart rate is in the upper 30's. In actuality most althletes and those in great shape generally have low heart rates because the heart is a muscle and like most muscles in the body they can be worked out like the rest of your muscles. Count yourself very lucky that you got a clean bill of health and have a heart that is beating slow and relaxed its alot better than the opposite........and congrats on your pregnancy and baby!