Decreased fetal movement

I am exactly 27 weeks today. Since Thursday I have felt a significant decrease in fetal movement. She was always so active but for the past few days it's been very seldom. The thing that worries me the most is she is always active at night and now I may feel her once or twice when laying down. I contacted the on call doctor on Saturday morning because I barely slept the night before due to being so worried. She said I was in that area between 26 and 28 weeks where it's not necessary to feel them move consistency and it may still be inconsistent. She asked me to eat/drink something sweet and lay down for two hours to see if I felt her. I felt her about 4 times in that two hours and she said any movement is good. So I kind of let it go, hoping it would pick back up. But it hasn't. Has anyone else experienced this?? Should I be worried??