During the middle of your menstrual cycle, the female hormone called oestrogen, produces another hormone called luteinising hormone (LH). The increased level of LH causes a follicle (a small, fluid-filled sac in your ovary) to release an egg. Within 24 hours of the egg being released, it is ready to be fertilised by a man's sperm.
After ejaculation, sperm can live for at least 48 hours, and up to seven days inside your vagina or womb after sex. This means that it is possible for you to become pregnant if you have unprotected sex two days before, or a couple of days after, ovulation - that is, between day 10 and 16 of your menstrual cycle. The least likely time that you will conceive is between days 1 and 7 of your menstrual cycle.
When ovulating, some women experience signs such as breast tenderness, abdominal pain, slight vaginal bleeding, or a slight temperature increase. An increased, more watery vaginal discharge is also common.
You can buy special ovulation prediction kits, which test your temperature or hormone levels to find out when you are at your most fertile.
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