and not resent DH for not earning enough!!
That doesn't look a like a brilliant basis for adding to the children you have in itself.
I understand broody.
I understand the sense of loss when the number of children you hope for doesn't (or can't) happen.
I don't understand wanting to prioritise those feelings over prioritizing the general financial stability of the family for the existing kid's sake.
I really don't understand wanting to prioritise those feelings to the point where you risk destabilizing the relationship between the parents, potentially to the detriment of the existing children.
Sometimes as a parent you have to put the kids you have first, and think rather than feel.
It is VERY hard work to push past insistent feelings and put the logic and careful thought in pole position. You have to be very persistent in telling yourself that the kid here already takes precedence over the kids who may never come to be. It won't happen if you constantly focus on how unfair it all is that you can't have what you want when you want it and cast about for somebody to blame.
I really do feel for you, like I said, I do understand the sense of loss, but I think for you sake AND the rest of your family's sake you need to to do less dwelling and focusing on what you can't have, and instead underline for yourself the benefits of making a priority of the children who are already here.
"Think not feel" as a mantra is no sub for proper counseling, but counseling is not that easy to come by and I don't know if your situation would qualify under NHS based rules (would if I was queen of the world, I know the "loss" of non exisisitng children is very painful), but it is better than nothing and can be really quite effective if you put your shoulder to it and push like mad at creating a changed internal attitude towards the issue.
Good luck love, I hope you find a way through to a happier place with the family you DO have.