A earthquake that had the automatic size of ML3.7 did happen at 22:14 UTC on the Reykjanes. This earthquake was only 2.6 km away from a town in called Grindavík. The earthquake was felt well in town according to reports that I got over Facebook.
The ML3.7 (automatic size) earthquake location. Copyright of this picture belongs to Icelandic Met Office.
So far no aftershocks have happened where the main earthquake took place. But that might change at any time.