how many days before period do you get lh surge?
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Since LH hormone builds up in the urine, once it is detected in the urine, ovulation usually takes place within 12 to 24 hours (usually about 14 days before the start of a woman's menstrual period).
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LH surges are considered to trigger ovulation within 35–44 h. Ovulation itself initiates an endocrine shift from oestrogen to progesterone. These changes set in motion a process resulting in the start of the window of implantation 5–7 days after ovulation.
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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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You can only become pregnant if a sperm meets with and fertilises an egg. Ovulation normally occurs 24 to 36 hours after the luteinizing hormone (LH) surge, so identifying this LH surge helps you to determine when you are about to ovulate.
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["the length of your menstrual cycle – ovulation usually occurs around 10 to 16 days before your period starts, so you may be able to work out when you're likely to ovulate if you have a regular cycle.", 'your cervical mucus – you may notice wetter, clearer and more slippery mucus around the time of ovulation.']
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When does it happen? Ovulation typically happens around day 14 of a 28-day menstrual cycle. However, not everyone has a textbook 28-day cycle, so the exact timing can vary. In general, ovulation occurs in the four days before or four days after your cycle's midpoint.
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On average, the LH surge the OPKs detect occurs about 24 hours before ovulation, but the timing of the surge may vary from about 16 to up to 48 hours (15). ... Many women also experience false peaks of the LH hormone days before ovulation actually occurs, which may also result in false positives (8).
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It usually happens 10 to 14 days after ovulation – about two to seven days before your regular period is scheduled to arrive. Because of the timing, many women mistake implantation cramps for PMS.
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When is ovulation? Menstrual cycle length varies from woman to woman and from cycle to cycle but is typically between 23 and 35 days. Ovulation usually happens 12-16 days before the next period. Many women think that they ovulate on day 14 but this is just an average.
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Ovulation tests only identify the LH surge up to 24 to 48 hours before ovulation, and sperm can survive in the body up to 3 to 5 days. Therefore, if you have intercourse before you discover the LH surge, the egg could still be fertilized.
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One word of caution: ovulation can occur within a TWO day window after a positive LH surge, so have intercourse once a day for two days after a positive test.
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If you start testing too early in your cycle or too late (after the LH surge has occurred) then you may see a lot of High Fertility days. If you started testing on the correct day for your usual cycle length and you see 9 or more days of High Fertility, it is unlikely that you will see Peak Fertility in this cycle.
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It's difficult to pinpoint exactly when ovulation happens but in most women, it happens around 10 to 16 days before the next period. "It's not accurate to say that all women are fertile on day 14 of the menstrual cycle," says Belfield.
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Why is the LH surge important? Your LH surge is important because it initiates the beginning of ovulation and your fertile period. If you're trying to get pregnant, this is the best time for you to begin having sex without a condom. Once the egg is released, it's only viable for about 24 hours.
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The LH surge begins around 36 hours before ovulation. Once the egg is released, it survives for about 24 hours, after which time the fertile window is over. Because the period of fertility is so short, it is important to keep track of it when trying to conceive, and noting the timing of the LH surge can help.
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Day one of the cycle is the first day of your period. Ovulation most likely occurs around day 18. You should get a positive result on an OPK a day or two before that, on day 16 or 17. It's a good idea to start testing every day (or every other day) in the morning a few days before that, around cycle day 13.
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Ovulatory Phase This peak in estrogen triggers a brief surge in Luteinizing Hormone (LH), which triggers ovulation within usually 24 hours and occasionally up to 48 hours.