the moment at the centre of the cycle
ovulation is the release of a mature egg from one of the ovaries, and it sits at the midpoint of the menstrual cycle, dividing the follicular phase from the luteal phase. it is a brief event, usually thought to happen over a matter of hours, but it is the result of weeks of hormonal build up.
what triggers ovulation
during the follicular phase, a developing follicle in the ovary produces rising levels of oestrogen. once oestrogen reaches a high enough level, it signals the brain's pituitary gland to release a sharp surge of luteinising hormone (lh). this lh surge is the direct trigger for ovulation, causing the mature follicle to rupture and release its egg, usually within around a day or so of the surge beginning.
what happens to the egg
once released, the egg travels into the fallopian tube, where it may be fertilised by sperm if it is present. an egg is generally thought to survive for around 12 to 24 hours after release. this is quite different from sperm, which can survive in the reproductive tract for several days, which is why the fertile window is usually considered to span a number of days leading up to and including ovulation, rather than a single day alone.
when does ovulation happen?
ovulation timing depends on the length of the follicular phase, which varies between individuals and from cycle to cycle. in a cycle of average length, ovulation often happens somewhere around the midpoint, but because the follicular phase is the more variable part of the cycle, ovulation can happen earlier or later than expected, especially in naturally longer or shorter cycles.
after ovulation
once the egg is released, the ruptured follicle transforms into a temporary structure that produces progesterone, along with some oestrogen. this shift marks the beginning of the luteal phase, during which the body prepares the womb lining to support a possible pregnancy.
signs some people notice
not everyone notices clear signs of ovulation, and that is entirely normal, but some common changes include:
- a change in cervical mucus to a clearer, stretchier texture, similar to raw egg white.
- a slight rise in basal body temperature after ovulation has occurred.
- mild lower abdominal twinges on one side for some people.
- a temporary lift in energy or mood around this time.
a note on tracking and fertility
understanding ovulation can be useful for people trying to conceive, avoid pregnancy, or simply understand their own body better. tracking methods, such as monitoring cervical mucus or basal body temperature, can offer helpful clues but are not always perfectly precise, since ovulation timing can shift from month to month.
if you are trying to conceive and have concerns about ovulation, or if your cycles seem irregular or absent, it is worth speaking with a healthcare professional, who can offer guidance suited to your individual situation.