This is very difficult to comment on as I do not have the clinical information in front of me. When a baby's heart beat is monitored antenally we like to see a baseline heart beat of between 110-150, a variability of about 10-15 beats (so not constantly at the same level) and accelerations and movements aswell as periods of rest. Periods of accelaration are normal and from what you have told me I would not say there is anything to worry about.
However, if you have any concerns at all do not hesitate to make an appointment to see your doctor or midwife again.
I went for a check at the hospital yesterday due to a Kidney infection I've developed and the midwife there monitored the babies heart for 45mins. She said it was strong but that it was having periods of acceleration which was uncommon at 29 weeks. Can anyone tell me what 'periods of acceleration' means and should I be worried about my baby? Cheers