Hi K,
What you had experienced is what normal in most
ladies. When you have that urge to pee let the fucking goes.
Don't fret. Sooner or later that pee felling would convert to
orgasmic feeling. And if you let the fucking proceed further
you would suddenly go into orgasm and in extreme cases your legs and
buttocks would vibrate on their own. Then you'll be in heaven.
Enjoy.