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Yea, that sucks! But it is not particularly uncommon with any gun and usually results from a wacky casing the swells or contorts and lodges between the slide and barrel. There is likely nothing wrong with your gun. The easiest and maybe safest way to resolve it is to remove the mag and examine the gun to make sure that the chamber is fully closed/locked up. Then take the gun somewhere where it can be fired and fire the round. Usually the empty casing ejects and the problem is solved. If not, at least you know you have an empty casing lodged in the chamber.
There are a couple other ways to resolve this and they all require some brute force, of sorts. Pulling on a slide does not generate sufficient blunt force overcome the jammed round. You need to secure the slide in a stationary position and apply some
pushing force to the grip. This, of course, should not cause the gun to fire so long as you don't touch the trigger but EXTRA DILIGENT SAFETY CONCERNS ARE APPROPRIATE. I would even wrap duct tape around the trigger guard before doing either method.
Assuming you are right handed, the first approach is to grasp the slide with a death grip in your left hand. Then form a "U" with your right thumb and remaining 4 fingers and jam your right hand into the grip. Obviously keep the muzzle in a safe direction and keep all parts of your left hand clear of the muzzle, just in case.
Another method with larger guns is to wedge the rear sites against a benchtop edge and push down hard with the right hand on the grip. Of course that doesn't work with P3 sites but you can carefully get the thin, top edge of the slide, just under the front site, on the edge of a bench, where the barrel can clear the bench's edge, and push down hard. Make sure your feet are not in the line of fire! I was able to do that with a P11 years ago.
The brute force methods are akin to clearing a jammed pump shotgun by holding the slide and smacking the butt on the ground. If it were me, I might just take a little drive out to the country and pop off the round. If you are uncomfortable with any of this, my advice is to call a local gunsmith. Good luck and be safe!