how fertile are you the day before your period?
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'If you have regular cycles, then it's highly unlikely you can get pregnant two days before your period as, after ovulation, the egg is only around for 12-24 hours and ovulation in a regular cycle will have occurred two weeks before your period,' says Fertility and pregnancy expert Zita West.
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A study amongst women trying to get pregnant found that only 13% correctly estimated their ovulation day, and only 55% of women estimated their day of ovulation within their fertile window (six days – five days prior to and the day of ovulation)3. Many women believe that ovulation occurs on day 13 or 14 of their cycle.
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The best way to increase your odds of getting pregnant quickly is to make sure that you're having sex at the right time in your cycle. If you have regular cycles, you will ovulate around two weeks before your period. This means your fertile window will be the seven days before your expected ovulation.
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The first step is to learn the days when you're most fertile. Most women have a 28-day menstrual cycle. That means you have about 6 days each month when you can get pregnant. That includes the day that one of your ovaries releases an egg, called ovulation, and the 5 days before.
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Your menstrual cycle begins on the first day of your period and continues up to the first day of your next period. You're most fertile at the time of ovulation (when an egg is released from your ovaries), which usually occurs 12 to 14 days before your next period starts.
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It's possible to get pregnant at any time of the month. The day prior to ovulation, and the day of ovulation itself, being your two most fertile days. Once the egg has gone (usually within a day of ovulation) you cannot get pregnant until after your next menstrual cycle has started.
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This is because ovulation generally occurs 12-16 days before your next period begins, and this would estimate you ovulating at days 6-10 of your cycle.
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Conception is possible during the 'fertile window' – the five days leading up to, plus the day of ovulation. The chance of you becoming pregnant is greatest if you have sex during the two days leading up to or on the day of ovulation. Ovulation happens about 14 days before your period starts.
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However, it is still possible to get pregnant if you have sex without contraception. You are at your most fertile when you ovulate, which happens around 10 to 16 days before your next period. You may ovulate earlier if you have a short cycle.
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One of your ovaries will release an egg (ovulation) about 14 days before your period starts. The first day of your period, when you start bleeding, is counted as the first day of your cycle. If you have a 28-day cycle, you'll usually ovulate some time between day 10 and day 15 of your cycle.
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Now when we try to get pregnant, we find out it's not quite that easy. There are actually only about 6 days during your cycle when you can become pregnant. The five days before ovulation and day of ovulation. And while some women may get pregnant right away, for others the time to pregnancy may take a little longer.
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Ovulation usually occurs in the middle of your menstrual cycle — about two weeks before your period — but not everyone's cycle is regular. Even for those with a regular cycle, it's possible to ovulate earlier or later. This can shift the fertile window by a few days in a given month.
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Ovulation usually occurs about two weeks before the next expected menstrual period. This is because the luteal phase of the cycle usually lasts 12 to 14 days. So if, for example, you have the often-quoted 28-day cycle, your ovulation probably occurs on Day 15 of the cycle.
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You are fertile on the days leading up to and around the time of ovulation – due to the lifespan of sperm – and if you have a short cycle you could be ovulating just after your period. So you could be fertile very early in your cycle when you are still bleeding.
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Sex as early as 5 days before ovulation can lead to conception, but the chances are highest with sex the day immediately before the egg is released. Some women on a 28-day cycle ovulate around day 14 after the start of their last period.
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Among the 69 cycles for 28 days in our study, ovulation occurred 14 days before the next menses in only 10%. Time from ovulation to next menses ranged from 7 to 19 days (days 10 to 22 of the menstrual cycle). Thus, the fertile window can occur much earlier or later in the cycle than clinical guidelines suggest.
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The probability of conceiving if you have sex two or three days before your period is extremely low. Since your egg lives for around 12 to 24 hours after it is released, this means your fertility window closes soon after you ovulate. However, there is always a risk of pregnancy.