" During the period in question, the changes in the empty space in
the womb can only be identified by an anatomical or gynecological
examination. Yet these changes, only recently identified by scientists,
are miraculously indicated in Surat ar-Ra‘d:
Allah knows what every female bears and
every shrinking of the womb and every
swelling. Everything has its measure with
Him. (Qur'an, 13:8)
At the beginning of the menstrual
period, the mucous on the walls of the
womb (the endometrium layer) is 0.5
mm (0.02 inch) thick. Under the effect
of hormones secreted by the egg, this
layer grows and reaches a thickness of
5-6 mm (0.2 inch). This layer is then
discarded in the absence of fertilisation. As
we see from the above verse, this monthly
increase and reduction in the walls of the
womb is indicated in the Qur'an. "

― Harun Yahya , Allah's Miracles in the Qur'an