Never felt this before!

Husband and I have only been TTC (for the first time) for the past 3 months. Before TTC, anytime friends or colleagues have gotten pregnant I've never been anything but super excited and supportive of them. But.... Today something happened that I've never felt and was completely blindsided by. A dear colleague of mine who decided to start trying just a few months before us told me she was pregnant....... I felt like I had been kicked in the gut. I so badly wanted to be super excited and happy and bounce up and down with her. But.....I was secretly crushed. I didn't expect to feel this way and it's awful! How do you put on a happy face while secretly crying on the inside? How do you keep from wanting to cry every time someone asks "so when are you guys having a baby?" I've always worked hard and accomplished whatever I've put my heart, mind, body and soul into and for the first time I my life, all that I have simply isn't enough. I can't accomplish the one thing that means the world to us and create a life with the man I love. How do you cope with these feelings?