First of all Congratulations. This is wonderful. But I also feel your pain. It took us 5 years to have our first child. I started with clomid for about 6 months. I had one miscarriage. Then we went on the IUI for a LONG time. We took several breaks in between because it was just too much. I had 2 more miscarriages. We built our house and took about a 6 month break and then I decided to try again. Our doctor suggested IVF to be our next step. I had been spotting on and off, nothing really unusual, but it was a bit more than normal. While we were at the introduction to IVF class, the nurse asked how I was doing and I told her ok. I told her about the spotting and she had me give a urine sample, i wasn't sure what for. At this stage of the game, giving blood and urine samples was like any other daily activity. My Dh and I were sitting with the financial planner and the nurse came in and told us that we didn't need to talk to the planner. We looked at each other and wondered what the heck she was talking about. When we realized, we didn't know what to think. I was like you. I was happy, yet didn't want to get too excited due to my history. We walked on egg shells and decided not to tell anyone until I got to the second trimester. Even then we were very cautious. I was hopeful, but wasn't totally satisifed until the moment I heard her breathe in the delivery room.
I feel your struggle with your emotions. My whole pregnancy, I just tried to be as positive as possible. I just envisioned myself holding my baby in my arms. Every day, every week, every month was a milestone for us. I do not regret being cautious, but sometimes I do miss the fact that i wasn't totally excited. My long waited baby will be 10 in February. Her sister came 17 months later. She was a complete surprise and shock to us. I just kept thinking positive. If it was meant to be it will be. I went all out for that pregnancy.
I pray that soon you will hold your new baby in your arms and hear that wonderful sound the moment he/she is born.