Unhappy with my fiance..

My fiance and I had a miscarriage back in October. Found out a couple weeks ago I'm 7 weeks pregnant. But nothing feels the same with us anymore... I feel like after my miscarriage all our happiness with eachother left... I can honestly say I don't remember the last time I was happy.. We wanna make it work for the baby but I don't know what to do anymore.. Our sex life is gone.. we don't cuddle or anything anymore.. I just wanna be happy again but I don't wanna loose him because I do love him.. any advice?