At-Talaaq 65:4

As for those women from among you who reached their menopause, in case you doubt, their waiting period is three months, as well as of those who have not yet menstruated. As for pregnant women, their waiting period ends with delivery[5]. And whoever fears Allah, He will make his matters easy for him.

[5] This ruling for the waiting period of pregnant women applies also in case the husband dies.

And those who no longer expect menstruation among your women - if you doubt, then their period is three months, and [also for] those who have not menstruated. And for those who are pregnant, their term is until they give birth.[1700] And whoever fears Allāh - He will make for him of his matter ease.

[1700] The ruling concerning pregnancy applies also in the case of the husband's death.

4. And those of your women as have passed the age of monthly courses, for them the ‘Iddah (prescribed period), if you have doubt (about their periods), is three months; and for those who have no courses [(i.e. they are still immature) their ‘Iddah (prescribed period) is three months likewise, except in case of death][2]. And for those who are pregnant (whether they are divorced or their husbands are dead), their ‘Iddah (prescribed period) is until they lay down their burden; and whosoever fears Allâh and keeps his duty to Him, He will make his matter easy for him.

[2] (V.65:4) See the Our’ân, Verse 2:234.

And for such of your women as despair of menstruation, if ye doubt, their period (of waiting) shall be three months, along with those who have it not. And for those with child, their period shall be till they bring forth their burden. And whosoever keepeth his duty to Allah, He maketh his course easy for him.