Oh my goodness, you poor thing, may Allah ease the suffering of you and yours.
OK I'm speaking completely from a personal level here.
The decision to try for children or not is entirely down to you and your husband, obviously Allah is the one who grants us children and wealth etc. If you and your husband are both confident and secure in this deicsion, then quite frankly it is nobodys business but yours.
I have had relatives and very close friends suffer from terminal cancer at various stages in my life, and the enormity of living with this illness and its memories is something only one who has experienced it can understand.
Practically childbirth and pregnancy can be a hectic time in ones life, children demand attention and are utterly dependant on their parents (mostly the mother at the begining).
Emotionally a baby could be that bond between you and your husband which may be something to hold on to after this time in your life has passed you by. I don't know, I dont want to add to your pain.
The decision to try for a child is yours entirely, I pray Allah eases your suffering.
My very young cousin is suffering from terminal cancer, he has a very young wife (to whom he has been married I think about two years) and newborn baby. Everyone in the family is frantic, everyone but my cousin who is taking it all in very good humour...which is rather a strange thing to say but that is the way he is.
I never knew about that thing about Rizq sr JO has mentioned. But throughout my life (altho I have never gone thro what you are going thro), I find it very hard to take any sorrow thrown my way at all seriously, there is a rock hard certainity deep in my soul that as Allah has willed so shall it be, and Allah is the most beneficient the most merciful....
Even in my darkest moments, when my head is going, right this is it your stuffed, my heart is still utterly unshakeably certain that everything is just fine and will be fine even if it momentarily isn't.
Take care of yourself.
Love & Duaas