Echocardiogram/ fetal arrhythmia

Thursday I went to my appt and found the baby had an arrhythmia. Sent me to the high risk clinic and the monitored and checked me theybsaid when the baby isn’t having the arrhythmia his heart is really strong and a really good heart beat. I go back Friday for an echo but yesterday and today I checked with my own doppler (that’s where I noticed it first before my appt) and he doesn’t have it anymore. Has anyone had a fetal echo? How did it go?

I did drink a little coffee every morning and that day I didn’t. And that’s what happened. From

Now on The doctors said no caffeine... could that have been the reason?