Cycle and ovulation
The follicular phase runs from the start of the period until ovulation. FSH stimulates follicles to develop, oestrogen rises and the uterine lining thickens. This phase varies most in length between people and between cycles, which is why cycles of different lengths usually differ here rather than after ovulation.
Also known as: proliferative phase
Sources
- Healthdirect Australia (healthdirect.gov.au)
- Your Fertility, a national public education programme (yourfertility.org.au)
Last reviewed: 10 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.