decrease in fetal movement at 30w

I'm 30w3d currently and for the past 2-3 days, I've noticed a slight difference in fetal movement. Baby has not kicked/moved as often as he usually does and I don't have an OB appointment for another while. I haven't changed anything in my daily routine (ex. Haven't lifted anything heavy, changed my diet, fell, etc.) so I'm kinda worried. He still moves but it's strange that for 2-3 days now, he's been moving a lotttt less. Should I be concerned and call my doctor for an earlier appt?? Or has this happened to any of you? :(