What is ovulation?
Usually each month one ovary will be stimulated by hormones produced in the brain. These cause a small cyst or follicle to grow on the ovary in which an egg develops. Another hormone then causes the follicle to release one egg to travel down the fallopian tube where it can be fertilised by the sperm which swims up from the vagina. This usually occurs around 14 days after the beginning of a period, but can vary between 11 – 16 days.