Quran 65:4 from Surah At-Talaaq on Divine Marvels.
وَٱلَّٰٓـِٔي يَئِسۡنَ مِنَ ٱلۡمَحِيضِ مِن نِّسَآئِكُمۡ إِنِ ٱرۡتَبۡتُمۡ فَعِدَّتُهُنَّ ثَلَٰثَةُ أَشۡهُرٖ وَٱلَّٰٓـِٔي لَمۡ يَحِضۡنَۚ وَأُوْلَٰتُ ٱلۡأَحۡمَالِ أَجَلُهُنَّ أَن يَضَعۡنَ حَمۡلَهُنَّۚ وَمَن يَتَّقِ ٱللَّهَ يَجۡعَل لَّهُۥ مِنۡ أَمۡرِهِۦ يُسۡرٗا
English translation: And those who have despaired of the menstruation among your women if you doubt then their waiting period (is) three months and the ones who not [they] menstruated And those who (are) pregnant their term (is) until they deliver their burdens And whoever fears Allah He will make for him of his affair ease
Transliteration: wa-allai ya-is'na mina al-mahidi min nisaikum ini ir'tabtum fa'iddatuhunna thalathatu ashhurin wa-allai lam yahid'na wa-ulatu al-ahmali ajaluhunna an yada'na hamlahunna waman yattaqi al-laha yaj'al lahu min amrihi yus'ran