If you are in doubt (how to calculate the period) of such of your women as have despaired of monthly courses, then (know that) period for which they must wait is three months and (the same holds good) for such women as have not menstruated (for some other reasons). And (as to) pregnant women, their term (will end) when they are delivered of their burden (after giving birth to a child). And (bear in mind) for the one who keeps his duty to Allâh, He will provide facility in his affair for him.