What happens after LH surge?

Amber • 30 years old. We have one daughter, born on 2/10/14. TTC #2 since December 2014. Finally pregnant with #2 due 12/4/17!
On Friday I got my LH surge (the happy face). I forgot to test on Saturday, but I tested Sunday and it was back to no surge (empty circle). I BD'd Friday and Saturday. Does that mean I ovulated? Since Sunday there was no more surge? What do you think my chances are?