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On about day 14 of the cycle, the follicle ruptures and releases the egg cell. This is ovulation. After ovulation the egg is trapped by the oviduct and transported to the uterus. The uterine endometrium continues to develop, preparing to receive a fertilized egg cell. If the egg cell is not fertilized, it degenerates.
在大约月经周期的第14天，卵泡破裂排出卵子。这个过程叫做排卵。排卵后卵子被输卵管捕捉，运送到子宫。子宫内膜继续增厚，为迎接受精卵着床做准备。如果卵子没有受精，卵子会退化。
The uterine endometrium is sloughed off and discharged through the vagina, along with the degenerated egg and a small amount of blood. If the egg is fertilized, which usually occurs between day nine and day 15—the period of highest fertility, the embryo starts to implant in the endometrium. The cycle is stopped and menstruation does not occur.
子宫内膜脱落，和退化的卵细胞、少量血液一起通过阴道排出。如果卵子受精（通常发生在月经周期的第9天到第15天之间，这是最容易受孕的时间段），胚胎开始在子宫内膜上着床，月经周期停止，不会再发生。
Once it is implanted in the endometrium, the embryo secretes human chorionic gonadotropin (HCG). This sustains the corpus luteum, which continues to secrete progesterone and estrogen.
一旦在子宫内膜上着床，胚胎分泌绒毛膜促性腺激素HCG。HCG维持着黄体，黄体持续分泌雌激素和孕激素（维持妊娠）。
