4 phases of the menstrual cycle

1. The Menstrual phase: Day 1 to day 15.
2. The Follicular phase: Day 6 to day 14
3. The Ovulation phase: midpoint (14 day)
4. The Luteal phase: Day 15 to day 27.

Following are the 4 stages of your menstrual cycle-
(i)Menstrual phase -- Day 1 - 5
The menstruation flow is normal for the first 3 - 5 days. In some cases, this phase can range from 2 to 7 days. The bleeding in this phase is not just all menstruation blood; some of its is uterus lining the body doesn't need, and discards.
(ii)The follicular phase -- Day 6 - 14
During this period, cells grow inside little cavities (follicles) and eventually become eggs. It is one of these eggs and a male's sperm that combine to make a baby.

Menstruation hormones (Follicle Stimulating Hormone - FSH and Luteinizing Hormone - LH) are released into the bloodstream. The ovaries are where a woman produces eggs. The purpose of the first hormone (FSH) is to stimulate the ovaries to produce eggs. And the purpose of the second (LH) is to signal the ovaries to release an egg.

(iii)The ovulation phase -- Midpoint (Day 14)
During this phase, which is about the 14th day of your menstrual cycle, there is a sudden increase in the level of the second hormone (LH). This is the cue for the sac (follicle) containing the most mature egg to release it, for its journey down the fallopian tube. It is during this phase that a woman is most likely to become pregnant.

(iv)The luteal phase -- Day 15 - 27
Around 20 eggs develop and the most mature egg gets released. While the eggs are developing, the sacs produce estrogen. And just before the most mature egg gets released, progesterone is also secreted in addition to estrogen.