There are four main hormones that work in a complex and intricate way during the menstrual cycle and play a key role in fertility.
Menstrual cycle - Wikipedia
How Female Hormones Impact Women''s Health - Not Just Fertility
Reproductive hormones and their generalized functions.
How Your Monthly Cycles Relates to Your Fertility - Fertility Answers
A question of balance: understanding hormones and fertility
Fertility Roles of Estrogen, Progesterone, and Testosterone
What Is Progesterone?
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Female Reproductive System - Menstrual Cycle, Hormones and
Fertility hormones and IVF, GCSE biology resource
What Are The Female Fertility Hormones And What Role Do They Play?
Progesterone, Pregnancy, Menstrual Cycle & Endometrium