Certainly know how that feels, My wife and I have 4 kids in 6 yrs of marriage.
We are both open to life, have just begun to practice NFP, and fear a little every month or so. Fear, not because we don’t want another child, but all the other “concerns”. What will family say, can we afford it, my wife’s physical health, etc.
Part of NFP is the daily communication between spouses. Pray together!! Pray together!! pray together!! And talk.
Talk about all things. What you each would like for the future of your family. How to raise the kids. Discipline. Finances. And, what kind of ‘spacing’ of children. Put those things in prayer together.
Remember too, that part of NFP is abstaining. Atleast the first cycle. And all healthy marriages need the practice and virtue of chastity. Sometimes frustraion comes because one wants to enjoys the marital act without the natural end taking place. It becomes, “‘why cant we just enjoy each other?’, sometimes thinking about how others who practice contraception, get to have all the sex wothout really worying, and here I am , married , doing this right, the way I believe God wants me too, and I feel that everytime I have relations with my spouse, another child and all the burdens that come with that.”
Talk about it, listen to what he has to say without you coming to or giving a solution so quickly, just hear what he has to say.
pray for conversions of hearts. Pray for the graces to truly surrender to His Providence.
I hope this helps alittle.