During the menstrual cycle the thickness of the womb lining (Endometrium) increases several folds (2-16mm). This was however recently, however this was portrayed in the Quran 1400 years before it was discovered.
Allah knows what every female bears, and every decrease and increase to the wombs. With Him, everything is by measure.
٨ اللَّهُ يَعْلَمُ مَا تَحْمِلُ كُلُّ أُنْثَىٰ وَمَا تَغِيضُ الْأَرْحَامُ وَمَا تَزْدَادُ ۖ وَكُلُّ شَيْءٍ عِنْدَهُ بِمِقْدَارٍ
The thickness of the womb lining (Endometrium) increases between 2-16mm; but 1400 years ago this was impossible to detect.
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