In my view, it is OK to be cautious BEFORE pregnancy.

But once the woman has become pregnant, then everyone should accept it as Allah's will. When Allah sends a child into the world, he sends the 'rizq' with the child i.e. the new child will bring more prosperity to the parents inshaAllah.

Allah is presenting yet another flower to the parents, they should accept that flower whole heartedly; not turn away from it.