happy and heartbroken

When will it be my turn? It's so hard when you have to be happy for your friends when you are so heartbroken for yourself on the inside. After seeing back to back pregnancy announcements from two very close family friends who are sisters, I am just laying here wondering when is it finally going to be out time?? We've been trying for two years, have been on Clomid and letrozole and still no baby. It gets harder and harder every month. In a week I have to meet up with both of those girls and my best friend to go shopping for my best friends wedding dress and our bridesmaids dresses....it's also the day that AF is due. I'm praying and praying I get my BFP that morning before I leave to meet them. My heart just keeps breaking each month and I'm so exhausted. After one loss in 2013 I just can't help but wonder why it's not happening to us...why we aren't able to enjoy the blessing and greatness of becoming parents.