Emotional rollercoaster

I had a miscarriage on my birthday last March and then 3 months later was able to get pregnant again. While I am very excited about this pregnancy, the other part of me is still very very sad about the loss of the first pregnancy. I find out what I am having on the day that the first baby would be due and I am having a very hard time dealing with all my emotions. I feel terrible for feeling sad during such a happy time, but all I can think about lately is how I should be having my baby in a few weeks. I was just wondering if anyone else has went through this same thing and could tell me how they dealt with it.