Unfortunately Afib almost never happens just once. The good news is there are lots of good options to try minimize it.
Calgarypuck for Afib:
https://www.afibbers.org/forum/index.php
The top level site has lots of good info too.
Given you don't feel your afib (it can be incredibly uncomfortable for some), you may want go invest in a fitness tracker that can identify arrhythmias. More time in afib is more risk of another stroke, and also more risk of structural changes to your heart that will cause more afib.
Hopefully with the sleep apnea treatment you'll be good as gold!