However, the most fertile days are the three days leading up to and including ovulation. Physical changes during ovulation include altered vaginal secretions and a subtle drop and then rise in basal body temperature.Ī woman can become pregnant during the five days before ovulation or on the day of ovulation. Women's fertility: does 'egg timer' testing work, and what are the other options? This can be measured by a blood test, or more conveniently by urine dipsticks (the same mechanism used for at-home pregnancy tests). The actual time of ovulation, which occurs at the end of the follicular phase, is marked by the rise in a hormone called the luteinising hormone. All phases together are thought to amount to a cycle lasting 28 days. It’s traditionally been thought the follicular phase varies in length between women, whereas the luteal phase is relatively constant between women – generally around 14 days. The menstrual cycleĪ woman’s menstrual cycle consists of three phases: menstrual bleeding, the follicular phase (when an egg-containing follicle is growing) and the luteal phase (the two weeks after ovulation prior to the next period). And even if an app indicates when a woman is most fertile, it doesn’t mean a pregnancy will follow if a couple has sex during this window. While fertility apps use individualised information to estimate the most fertile period, they are not completely reliable. But they require some caution in their use. The personalisation and convenience of apps makes them empowering and attractive.
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