We had our 20 week ultrasound yesterday and found out we're having a little girl! The doctor's office called me 15 minutes after we left to say that they baby's heart rate had fluctuated between 133 and 76 during the scan. They don't know what could have caused it, so I have to go in for additional testing. Has this happened to anyone else? I'm trying to stay calm, but this is really scaring me. They said everything else looked great, they're just not sure what's causing her heart rate to fluctuate so much.