Second half of the menstrual cycle.The menstrual cycle is made up of four phases. Each phase serves a different function:Menstruation is when you have your period. This is your body shedding your uterine lining from the previous cycle in the absence of pregnancy. The follicular phase, which overlaps with menstruation for the first few days, is when follicles grow. One follicle will generally become larger than the rest and release a mature egg.
This signals the end of the follicular phase. Ovulation is when the mature egg is released. The luteal phase begins as the egg starts traveling down the fallopian tube. This phase ends when your next period begins.