Oestrogen and Progesterone are the two main hormones, these two hormones control the main events of the cycle:
Oestrogen - causes the lining of the uterus to thicken and grow
- stimulates the release of an egg at day 14
Progesterone - maintains the lining of the uterus. -- when the level of progesterone falls, the lining breaks down.
Stage 1- Day 1 to Day 4- caused by the lack of Progesterone - lining of the uterus breaks down
Stage 2 Day 4 to Day 14 - caused by Oestrogen - lining of the uterus builds up.
Stage 3 Day 14 - caused by Oestrogen - egg released
Stage 4 Day 14 to Day 28 - caused by Progesterone - lining of uterus maintained
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