Fetal arrhythmia

Went in for just a regular appointment and doctor heard babies heart skipping a beat, so I had an ultrasound and could clearly see the heart totally stop for a second and then start again after every 4 beats, but all parts of babies heart are there and developed. I'm being sent to a specialist to look more into it. I'm very scared for my baby but the doctor said usually this happens and it fixes itself. I was wondering if anyone else is going through the same thing??