Luteal phase

After ovulation the emptied follicle becomes the corpus luteum and produces progesterone, which keeps the womb lining stable and receptive. This phase is usually about 12 to 14 days. A consistently short luteal phase, or low progesterone, is sometimes investigated as part of a fertility work-up.

Also known as: second half of cycle, post-ovulation phase

Last reviewed: 8 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.