Another scenario is that the childless couple adopt. Then, very often, they relax and are able to conceive. It’s happened innumerable times.
To adopt is also a blessing. It shouldn’t be denigrated and I ask nobody to take that message away. Circumstances are so individual and to force an ipse dixit upon all marriages is not realistic. Otherwise why aren’t we guilt-tripping every possible couple to adopt and not to do the other thing? If it can be honestly said after honest consideration that it’s for the sake of God that a couple wants to pursue medical help to conceive, they should follow through — and that is not total lack of faith, it is quite the opposite.