36 weeks 3 days High baby HR

Arielle
Today at my regular weekly appointment, my baby's heart rate was 180! This alarmed me, but apparently not the midwife, who said it decelerated down to 160s and then back up and down again. She said we must have caught her in an acceleration. This worries me, as her HR is usually in the 130s. Has anyone else experienced this?? Is she in stress?