36 weeks pregnant: baby not moving much today...maybe paranoia??

Last night i stayed up late cleaning and moving furniture around. Left me in so much pain that I could not sleep. But finally did around 5am. Woke up a few times but slept all day until about 5pm. I am still in a lot of pain mainly in lower back and legs. I dont think i am having contractions. So the problem is i have not felt baby move much since last night. He is normally very very active. Today barely anything. Subtle movements here and there after i drank some milk but nothing like usual. I am very concerned but maybe just paranoid. I called the on call dr who said to go to labor and delivery for some monitoring. I said i can only go by ambulance. He said take a taxi but did not seem overly concerned. I do have an nst and ultrasound in the morning. Should i just wait it out or call 911?