Abnormal biophysical profile

Has anyone else had to go in for non stress tests and biophysical profile ultrasounds? I go twice a week and had my first abnormal one yesterday. He's not practicing his breathing movements anymore. We went again today and still no change. My doctor said its unusual but the two most important things are heartbeat and movement and he is doing very well in both those areas. If he does not start practicing breathing movement again soon my doctor said we might need to get him out next week! I'm 36 weeks today and he said 37.5 would be when he should come.