MacBook Pro Trackpad does not "click"

Last night the click function on the trackpad of my MacBook Pro stopped working. I can scroll and move the cursor like always but when I go to the bottom of the pad to click, nothing happens on the screen.

Right before I lost all function in the click ability it was tougher to use the function. I was having to press down harder (or a couple times) to get it to click.

I have searched the web a couple of hours trying to figure out the problem with no luck. My apologies if this has been discussed already but some of the threads I have read didn't quite exactly explain THIS particuar problem.

Any and all help is greatly appreciated! I'm hoping it's not a huge issue or a physical problem with the trackpad itself.