Baby’s Heart Rate

Elizabeth

Two days ago, I went in for a regular OB appointment and they checked the baby’s heart rate with the fetal Doppler. The nurse said it was in the 140s and that it was normal. But a month prior to this appointment I had an ultrasound and the HR was 178. Is it normal to see such a dramatic change in the baby’s HR? This is my first pregnancy so I am totally clueless!