Second baby, different father

I need a little support or advise if you will! I had my first child with another man, the man I am with now has been our lives since my first born was about 6 months, and well 6 years later we just found out we are pregnant!! Yay happy time right? Well my first pregnancy was a disaster and not healthy at ALL! Even after having my son I had PPD and was boardlerine. Now with this pregnancy everyone is happy including my son which is the best feeling BUT I am scared he may get jealous or hateful. Am I feeding too much into this?