You definantly DID NOT hit a nerve. You were close though. I've hit countless nerves in my thighs, enough to almost entirely stop me from quad shots. When you hit the nerve, youll know it!!! Alot of the time the muscle with jump and spasm as the needles moves through it. You'll get a slight tingling when you're close. If you get that tingling...I'd back out a bit and change your angle just slightly.
Be careful because you can cause nerve damage this way.