How to stay positive?!

I had a miscarriage back in December at 11weeks and a chemical pregnancy in March. I found out a few days ago that I am pregnant again!! My question is for those of you that have experienced loss and then became pregnant again, how you stay positive and not get paranoid that something might go wrong with this pregnancy? I am trying to be excited but have hesitations and all because I'm afraid to get excited to only have something happen and I lose the baby again. What can I do?!