I feel the inside sides of my breast is wet, is my implant leaking?

The sign that your implant is leaking is that here is a loss of volume.  This is not subtle.  After two days, the implant would be flat.

 If your saline implant is leaking, your breast will become smaller. The new gel implants are not liquid, so cannot leak. Some may form a collection of tissue fluid, a seroma, around the implants in the early stages of healing. Occasionally, this seroma will not dissolve. I would suggest meeting with your surgeon and being checked.

It is unlikely that your implant is leaking because saline implants will tend to completely deflate. Silicone implants (at least modern ones) when ruptured will not leak any fluid. It is possible that you have a fluid collection known as a seroma which is something that should be examined sooner rather than later. In either case, the only way to find out what is actually going on is to have a consultation with a board-certified plastic surgeon who can examine you and order any tests that might be necessary. Best of luck!