Dr is worried

OK so I'm 32 weeks today. Had an ultrasound to check for movement and practice breaths. My daughter couldn't sit still. I thought everything was good. Then the nurse called and said the Dr wanted me to come in to get a stress test done. They didn't see her taking practice breaths and the Dr is really concerned. I've been crying for the last hour. I'm freaking out. In the past 48 hours I've gotten 4.5 hours of sleep. I can't sleep at night now I have to worry about my baby. I don't know what to do.