If there’s no implantation, then there’s no hCG produced and the corpus luteum eventually degrades. The embryo implants during this phase and begins secreting hCG that signals to the corpus luteum to keep producing progesterone (this continues for about 10 weeks). This maintains the thickened endometrium and transforms its cells and architecture so it can accept an embryo for implantation. ![]() The empty follicle is now called the corpus luteum and begins secreting a variety of hormones such as progesterone (P4), so P4 levels begin to rise. The leading follicle ovulates and the egg is released into a fallopian tube.įrom CD15 to CD28 the endometrium is now in the secretory phase (aka the luteal phase). Menstruation and the proliferative phase both occur while the follicle is developing, so CD1-CD14 is can be called the follicular phase.Į2 eventually peaks and this causes an LH surge to trigger ovulation. During this phase, the cells of the endometrium proliferate and thicken. These developing follicles begin to produce estrogen, or more specifically estradiol (E2), which causes the endometrium to enter the proliferative phase (CD6 to CD14). LH/FSH causes follicles in the ovaries to develop. During this period, GnRH acts on the pituitary gland to secrete LH/FSH. Source: Isometrik, CC BY-SA 3.0, via Wikimedia CommonsĬycle day 1 (CD1) to about day 5 is menstruation. This post is mostly a summary of a paper published by Mumusoglu et al. In this post I’ll go through the different types of FET protocols.
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