Arrhythmia/Bradycardia

Hello at 27 weeks me and my husband went to have a 3d ultrasound we were excited to see what our little girl was looking like but instead we found out she has some sort of arrhythmia and her heart beat suddenly drops and then goes back yo normal! We were referred to a specialist but I dont see him till the first, which by then I will be 30 weeks, so its been 3 weeks of a lot of worry and stress!! Has anyone gone through something similar? If so, what was the outcome of it all? Any input would be highly appreciated, I need some peace of mind!