EBF, first baby, and not losing any weight at all. help

Has this happened to anyone? This is my first baby and  I am EBF constantly. Every two hours and my son is now 3 months old. I have failed to loose any weight after the 13 pounds I lost right after delivery . I have been working out, eating healthy and drinking water. It is super frustrating not to mention making me really depressed about the way I look.