وَاللَّائِي يَئِسْنَ مِنَ الْمَحِيضِ مِن نِّسَائِكُمْ إِنِ ارْتَبْتُمْ فَعِدَّتُهُنَّ ثَلَاثَةُ أَشْهُرٍ وَاللَّائِي لَمْ يَحِضْنَ وَأُوْلَاتُ الْأَحْمَالِ أَجَلُهُنَّ أَن يَضَعْنَ حَمْلَهُنَّ وَمَن يَتَّقِ اللَّهَ يَجْعَل لَّهُ مِنْ أَمْرِهِ يُسْرًا
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سورة الـطلاق
(65/4) And if you become suspicious of your women who have despaired of menstruation, then their prescribed time is three months, and of those too who have not. The waiting time for the loaded (pregnant) women is until they lay down their burden (give a birth). And whoever becomes the owner of piety towards Allah, (Allah) makes easy for him his affair.
Surah At-Talaq