I noticed a knot in my gum day before yesterday. There was NO pain at all?

It could be a lot of things, but you really need to see a dentist. Depending on where you live, you may be able to get free care. Look for dental schools or free emergency dental care in your area. Call social services or even you doctor and see if they can refer you to a emergency free dental clinic. They are usually income based so if you cant afford to pay, then they will take care of you for free.