I didn't see your previous thread.
Is there something(s) specific that you're concerned about with having another child?
Because if you're concerned that he will not help enough with housework/parenting, then that's a concern that can be talked about and hopefully resolved.
If it's more a case of "I was enjoying the fact that I've only got about another 10 years of having a child at home and I'm looking forward to having less responsibilities and more freedom" then that is a perfectly valid reason to not have another child - but unfortunately it's not something that can be resolved within the relationship.
I'm saying this as someone with infertility. I was never able to have my own biological child. My D(S)S is now an adult and even having gone through that soul-destroying longing for a child of my body, I wouldn't now want to rewind the clock and start all over again.
If you are reluctant, or even if you're ambivalent, about bringing another child into the world, I really don't think you should do it.
Of course it's entirely your choice, and it will be a very difficult one either way 