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If you want to know when you are likely to be most fertile, you could buy an ovulation prediction kit. These kits, which are available from pharmacies, measure the amount of luteinising hormone (LH) – the hormone that stimulates the release of eggs from your ovaries each month – in your urine.

The kit identifies a surge in this hormone, which precedes ovulation by around twelve hours. This can help establish the fertile days in your cycle. Ovulation prediction kits are more accurate than temperature charts and avoid the need for regular temperature assessment, but they are also more expensive.