Question

What is happening in the uterus that leads to menstruation?

Answer 1

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Every month the ovary releases one ova or oocyte.

Then the ova is transported to fallopian tube which is the site of fertilisation.

The fertilised egg then moves to uterus where the walls are thickened in order to provide nutrition.

If the cell doesn't fertilise then the wall of uterus breaks and it turns to menstruation.

Answer 2

Your progesterone continues to rise to support a possible pregnancy. Right after ovulation, your estrogen drops, but you're producing even more progesterone so the uterine lining is thick enough for potential impending fertilization. The egg doesn't travel all the way to the uterus in order to find the sperm, though.