A follicle does not burst on schedule: only the mid-cycle LH surge ruptures the Graafian follicle and releases the oocyte into the fallopian funnel. Across the 28 days of the cycle, oestrogen climbs through the first half as the endometrium thickens, then progesterone from the corpus luteum holds that lining through the second half. If implantation follows, the blastocyst embeds in the prepared lining; if not, both hormones fall and the lining sheds as menstruation.
A follicle does not burst on schedule: only the mid-cycle LH surge ruptures the Graafian follicle and releases the oocyte into the fallopian funnel. Across the 28 days of the cycle, oestrogen climbs through the first half as the endometrium thickens, then progesterone from the corpus luteum holds that lining through the second half. If implantation follows, the blastocyst embeds in the prepared lining; if not, both hormones fall and the lining sheds as menstruation.
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