Day 1-5 Lining of uterus sheds
Day 6-12 New egg matures in ovaries/ Lining of uterus thickens with
blood and tissues
Day 13-15 Ovulation (egg released from ovaries into fallopian tubes)
Day 16-28 Unfertilized egg dissolves on its way to uterus/ Lining of uterus still thickening

Click below to read about related topics.

Introduction
Understanding Your Period
Your First Period: Don't Panic!
A Day-by-Day Guide
Dealing with PMS
Hygiene
Discomfort & Pain
Toxic Shock Syndrome
Menstrual Cycle Myths