High fetal heart rate

Ka

So I am 29wk5days FTM and went for my checkup today where I was told the baby’s heart rate was reaching over 170 and I needed to be put on a fetal monitor for 20 mins to watch-as soon as I heard that I started sobbing and they were trying to calm me down. I was on the monitor for over an hour due to the baby nonstop moving!! They said they measured 155 as the stable heart rate and that it probably jumped due to increased fetal activity. I was told we are ok but has this happened to anyone else?