Translation:

4. Such of your women as have passed the age of monthly courses for them the prescribed period if ye have any doubt 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.

Notes (Tafseer)

5513. Cf. ii. 228, For normal women, the 'iddat is the three monthly courses after separation: if there are no courses or if the courses are in doubt, it is three calendar months. But that time it will be clear whether there is pregnancy: if there is, the waiting period is still after delivery.

5514. Cf. n. 5511. If there is a true and sincere desire to obey the Will of Allah and do right the difficulties will vanish, and these delicate matters will be settled for the greatest happiness of all.