3相月经周期
(周期第一天至月经第一天所见的子宫内膜）
 

图例: FSH: 卵泡刺激素： E: 雌激素： LH: 黄体生成素 P: 黄体酮
请注意，在排卵后的24小时内黄体酮水平升高相当显著。

The Three Phases of the Menstrual Cycle
(Seen as beginning with the first day of menstruation)
 

Key: FSH: the follicle stimulating hormone; E: estrogen; LH: the luteinizing hormone; P: Progesterone.
Note that the progesterone level rises considerably within twenty four hours after ovulation.