Coping with due date after loss

Tomorrow is the due date of what would of been my first baby. I don't know how to deal with this. I have been crying soo much these past few days. I don't want nothing to do with the holidays because I feel like I'm missing something I should of had. I am currently pregnant and worried that my sadness and crying could be effecting my pregnancy. This sadness is just uncontrollable, I just can't help it. Ever since my miscarriage this past June I always think about my baby that would of been. I cried all the time. It was and still is very hard for me.