Presta Valve Question

[Selkie]

Could I get some advice/guidance you mechanics out there? I was inflating my front tire the other day and twisted the locknut on the presta tube open so I could put air in the tire. All the air came out of the tire in one big burst. The locknut was the whole way at the end of the valve stem. That's the first time something like this has happened. While I was able to inflate the tire, and it's still holding air, I haven't taken that bike out for a ride for fear that the air will go out once I start riding (example, if I hit a bump). Am I being overly concerned? Did I damage the valve? Should I have the tube replaced? I checked Sheldon Brown's site to see if I could find any info but was unsuccessful. Any guidance would be very much appreciated!