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Menstruation only occurs if the released...

Menstruation only occurs if the released ovum is not fertilised. Why?

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If fertilisation takes place corpus luteum is retained in the ovary. It secretes large amounts of progesterone hormone which is essential for the maintenance of endometrium. In absence of fertilisation corpus luteum degenerates. This causes abrupt decline in progesterone hormone, causing disintegration of endometrium leading to menstruation.
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Fertilisation in humans is practically feasible only if i.The ovum and sperm are transported simultaneously to ampullary-isthmic junction of the cervix. ii.The sperm are transported into cervix within 48 hours of release of ovum in uterus. iii.The sperm are transported into vagina just after the release of ovum in fallopian tube. iv.The ovum and sperm are transported simultaneously to ampullary-isthmic junction of the fallopian tube.

Assertion: All copulations do not lead to the fertilisation and pregnancy. Reason: Fertilisation can occur only if the ovum and sperms are transported simultaneously to the ampullary isthmic junction.