So many circumstances can make you say a "definite no" and it sounds pretty normal to change your mind. I had tough ride after each babe, so much I thought I was done.
I did not nag DH, but it is worth the gentle chats. My DH is also in a different head space too (our youngest is nearly 4 and we have the "head and heart space" now for another baby).
Just begin the chats,gently, then you will know.
Much love
xoxo