4th Ayah from Surah At Talaq
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. And whoever fears Allah - He will make for him of his matter ease.
If you are in doubt, the period of waiting will be three months for those women who have ceased menstruating and for those who have not [yet] menstruated; the waiting period of those who are pregnant will be until they deliver their burden: God makes things easy for those who are mindful of Him.
And those of your women as have passed the age of monthly courses, for them the 'Iddah (prescribed period), if you have doubts (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]. And for those who are pregnant (whether they are divorced or their husbands are dead), their 'Iddah (prescribed period) is until they deliver (their burdens), and whosoever fears Allah and keeps his duty to Him, He will make his matter easy for him.
And those women from among you who have despaired of (further) menstruation, if you are in doubt, their ‘Iddah is three months, as well as of those who have not yet menstruated. As for those having pregnancy, their term (of ‘Iddah ) is that they give birth to their child. And whoever fears Allah, He brings about ease for him in his affair.
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.
Such of your women as have passed the age of monthly courses, for them the prescribed period, if ye have any doubts, is three months, and for those who have no courses (it is the same): for those who carry (life within their wombs), their period is until they deliver their burdens: and for those who fear Allah, He will make their path easy.