Hello girls ? how are you doing? I'm at 40 weeks and 4 days of my preg…

Hello girls ? how are you doing? I'm at 40 weeks and 4 days of my pregnancy. Today I went to the doctor, she sent me for an ultrasound, connected the machine with the trainee, and then went to the doctor who looked at it and said that in half an hour go again for an ultrasound because something is not right. I went out for a walk, ate after an hour and came back. I asked the midwife to connect the machine herself, and she put it on. Then I went back to my doctor, she said tomorrow we will do it again. I agreed and left. Now I am worried why? Who had this experience? My baby is active at night and quiet during the day,