And the estrogen, what it does is it begins the thickening of the lining of the uterus. It initiates the thickening of the endometrium that is needed for implantation to actually take place. So eventually when you form the mature secondary follicle, ovulation takes place and that follicle ruptures, releasing that secondary oocide, the xcel, into the pericneal cavity. And from the Peric neal cavity the secondary oocide moves into our fallopian tube. This structure right here. Now the fallopian tube basically acts as a passageway and allows the movement of the secondary oocide, the excel, along this canal and into the uterus.