For the past few days my chest has been giving me a mild pain occasionally, Recently I discovered there is a possibility I might be pregnant but I have a bit more time to pass before I can be positive on that. Today my right boob felt like someone had stabbed me in it. I have discovered I have a ping pong ball sized knot in my right boob, If you lightly press on it, it will move over to my nipple, and like wise you can move it back over to its original standing point on the far right side of my right boob. It is extremely painful to the touch & I am a very tolerant person when it comes to pain ! Even when not bothered it is moderately bothersome. I am only 16 yrs. Old & there is no history of breast cancer in my family, What could this be ? What should I do ?

It could be several things. Fibroids comes to mind at your age. However, it would be wise for you to have this checked out by your doctor. Although uncommon, breast cancer at your tender age is still a possibility.

Went to the doctor Friday, Indeed it is Cystic Fibrosis.
According to my mom it runs in the family.

Cystic fibrosis? Are you sure? The lung disease?

Or do you mean fibroid cysts?