Chow_13answered grow question 2 years ago You wont know until you harvest and break apart the other plants. Some grows you can get a little stress and they pop out a few balls and stop. Others they can just keep poping them out.
If that was the only outbreak then you should be ok, I'm sure you have checked daily and inspected the bud sites very closely.
I think your at the point where if anything did come out now it would be to late for it to seed, And if it seeded earlier you would of seen it. So I think you got lucky with spotting it.
Good luck and Happy Harvest.