Baby #3 or no?

Love

Ok me and my soon to be husband always wanted a boy and when we met he had a beautiful 5month old girl who to this day is my heart... Then we became pregnant with my first child our baby girl Harmony last year and now I'm currently 30 weeks pregnant with our second his third baby girl Nova. So all our girls are 1 year apart. We both honestly want a boy and think maybe if we try one more time we will get him but my STBH keeps going back and forth with wanting more kids and then not wanting more kids and I feel like I would be a burden to admit I really want more kids I don't know what to do honestly everytime we talk about it he gets upset I'm stuck idk what to do....