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If the egg has not been fertilised, the egg is re-absorbed by the body, the hormone levels drop, and the womb lining is shed.If sperm is present during ovulation, or some time during the next 24 hours, the egg may be fertilised.About 12 to 16 days before the start of your next period, an egg is released from your ovaries (ovulation).During ovulation, your cervical mucus becomes thinner and clearer to help the sperm reach the released egg.The lining of the womb thickens ready for fertilisation.At the same time, eggs begin to mature in the ovary.This is 28 days on average, but it’s normal to have a cycle that lasts between 21 and 40 days.Your cycle starts on the first day of your period and continues up to the first day of your next period.We have more information about how long it takes to get pregnant. Some people get pregnant very quickly but for some people it can take a little longer. This is often called the ‘fertile window’ and includes the 5 days before ovulation and the day of ovulation itself.

You’re the most fertile on the few days each cycle around ovulation, which is when an egg is released.ĭuring an average menstrual cycle, there are 6 days when sex can result in pregnancy. To increase your chances of getting pregnant, you need to get your fertile eggs and sperm together as often as possible. We have more information about understanding your menstrual cycle. There is more information about this below. But there are other ways of working out when you may be ovulating, such as changes in vaginal mucus, ovulation testing kits or measuring your temperature. This can make it harder to identify your ovulation date. You may have irregular periods if you can’t count your cycle and work out within a day or 2 when your period is due. This is just a guide to help you understand when you may be most fertile. You will then receive your upcoming fertile dates over the next 4 months. Your cycle length is the number of days between your periods, counting the first day of your period until the day before your next period starts. To find out your next fertile dates, you just need to select the date of the first day of your last period, adjust your average cycle length and click 'submit’.