Something is wrong with my baby girl. The 36th week is already in its…

Something is wrong with my baby girl. The 36th week is already in its second day of movement, and it's very weak and rare. Ultrasound is not working on Saturday-Sunday. How can I calm down and wait until tomorrow to go for an ultrasound? Still, I didn't change the sheets on time. Has anyone experienced a lull in movements at this stage? Were they checked properly or something was wrong?