Follicular phase
The first half of the cycle, from the start of your period until ovulation, when oestrogen rises and an egg matures.
The follicular phase begins on day 1 and lasts until ovulation. Rising oestrogen stimulates a follicle in the ovary to mature an egg and thickens the uterine lining.
Many people notice rising energy and mood during this phase.
Read more: Menstrual cycle
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