"Perfect heart rate for a girl!!"

I went to the doctor today and heart the heart beat again. His response when I asked for the rate was "perfect heart rate for a girl!" It was 155. It has been 168, 160, 152, and now 155. I know that these things aren't always accurate, but the anticipation is killing me!!!! I find out through an elective ultrasound tomorrow at 4:30pm!  Are there any old wives tales that were true for you? Lately a lot is pointing to girl (acne, moodiness, cravings, now heart rate). How about you? :)