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A woman is at her most fertile in the days around ovulation, and for a 28-day cycle this would be from days 12 to 15.

• To work out your fertile time, you need to estimate when ovulation will occur, which is usually 14 days before the first day on which your next period is due.

• For example, let’s say that your period is due to start on 24 August. Take 14 days from 24 August and this is the date around which you will ovulate. In this example, it is 10 August.

• Once an egg is released, it remains viable for around a day. Allow a day or so on either side of this for minor variations in the time of ovulation. Sperm can remain viable in the woman’s body for around two days.

• Therefore, the fertile time is estimated as being from two to three days before to two days after the estimated time of ovulation. This is the best time to try to conceive.

Some women know when they are ovulating because they feel lower abdominal pain at the time when the egg is released from the ovary. The pain is quite normal and is referred to as ‘Mittelschmerz’ (from German words for ‘middle’ and ‘pain’ – hence pain felt mid-cycle).