It was a surge but then your body didn't release the egg for some reason. Since hormones make the surge, AND make O symptoms, you will have ovulation symptoms. Then your body doesn't actually ovulate, the symptoms go away, hormone levels drop, and you'll be in a kind of holding pattern for a few days or weeks and then your body will surge again and usually actually ovulate the second or third time through.
Do be aware you may have surged and ovulated again, just later, and could actually be pregnant if you continued to have unprotected sex (just too early to be detected by pregnancy test). Or, you may have ovulated and missed the egg, or you may not even have ovulated yet!