I don't think any of us can answer for these women. They probably know about contraception (after 20 years) but can't access it now. I haven't read all the answers t.b.h. so I'm probably just repeating. The conditions are horrible, but if one's husband insists on having sex - there's not a lot you can do. (Certainly not in their circumstances.)
I honestly don't know about the level of understanding amongst Afghan males, who does, but there may be pressures - supplying future 'Warriors for Islam'; proving yourself a powerful male? I think that contraception is more an issue for the women than for the men.
Going back over 20 years when I found myself thrust into the position of giving sex education to a bunch of Pakistani boys and girls (13+) for one whole lesson. It turned out to be necessary to explain that a Mars Bar wrapper was not sufficient.
I have a horrible feeling that that is the sort of level which pertains in Afghanistan now.
We can't do anything, Bobbi. We've tried in the past. Nothing really works,