D-man, It may not be a problem at all.

I would "test the system".

If you can possibly stand to do so ;) , wait a few days and try again....as in abstain for a day or two...then see what happens.

Having "too frequent" emissions, stress factors, and other "mental" complications can all weigh into sexual performance...very subtly. You are blaming your p.c. muscles when instead, something "else" may be blocking your climax. For now, try not to worry about it.

Allow some time and see what happens.