Your Menstrual Cycle is made up of 4 different phases:

1. Menstrual - No hormones
2. Follicular - Estrogen + Testosterone rising
3. Ovulation - Estrogen + Testosterone peak
4. Luteal - Progesterone peak 
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During each phase you produce a different combination of hormones that have certain roles in fertility: 
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1. Estrogen - ovulation, sex drive, brain and tissue support
2. Progesterone - maintains pregnancy, calms, relaxes, chills
3. Testosterone - sex drive, motivation, tissue support

Knowing the timing of these phases is important for understanding what is happening in your body and  how it affects your fertility.