Reduced fetal movement 29 weeks (high risk for preterm labor)

So I just had an ultrasound and checkup this morning and he wasn’t moving like normal but heartbeat and everything was good so I didn’t think anything of it. Baby boy has been a wild man with kicks and movements every day since 20 weeks so I’ve never had to worry about kick counting. It’s always been predictable when he’s going to move most and what foods will make him move and he usually goes nuts. It’s been over 24hrs now and I’ve really only felt him move twice. Im having some slight cramping and Braxton Hicks but nothing consistent or timetable. I called the on call doc and she wasn’t concerned but I feel like I should be since this is SO abnormal for him. Is it right to be concerned and should I ask to get checked out again or am I just overreacting? What would they even check if I went in again that they didn’t already check at my appointment? TIA!!