The "phase of the uterine cycle from ovulation until the corpus" luteum breaks down is the

Luteal Phase

The Ovarian Cycle is composed of two phases namely the follicular phase and the luteal phase. The follicular phase( day 0-7 includes the transformation of follicles from primordial to primary to secondary to selected tertiary follicle. It ends with ovulation. Luteal Phase begins with ovulation as the corpus luteum becomes corpus albicans and degrade (day 14-28).

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.

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explanation: