Menstrual Cycle Days 1–12: Period, Uterine Lining and Repair

Day one. The menstrual cycle begins. The thick

lining of the uterus starts shedding, creating

the first flow of the period. Day two. This

is the heaviest day. The uterus contracts more

strongly, releasing the built-up tissue. Day

three to four. The flow begins to lighten as

the lining becomes thinner. Day four. The period

is becoming lighter as the uterus starts healing

internally. Day five. The period comes to an

end. The body begins preparing for the next

cycle. Day six. Repair begins. New cells start

forming, and estrogen levels slowly rise. Day

seven. A fresh lining begins to grow inside

the uterus. Day eight to twelve. The uterine

lining becomes stronger and thicker, preparing

for ovulation.