21. Keeping a BBT chart enables accurate identification of menstruation, when pre-ovulatory calendar rules may be reliably applied. 22. In temperature-only systems, a calendar rule may be relied on alone to determine pre-ovulatory infertility. 23. Diagnosis of ovulatory problems is routinely carried out at an early stage and is not mentioned further in this paper. 24. Hormonal forms of contraception can be taken to prevent ovulation and therefore ovulatory pain but otherwise there is no known prevention. 25. Also ovulatory problems and poor coital technique may affect the PCT . The test is useless in presence of cervical infection. 26. On days 15 to 28 the post-ovulatory stage, the Graafian follicle now called the corpus luteum secretes estrogen. 27. The most common cause of female infertility is ovulatory problems, which generally manifest themselves by sparse or absent menstrual periods. 28. A study found that the treatment usually restores women's ovulatory cycles while reversing hormonal imbalances and other effects of the condition. 29. Additionally, women generally have lower olfactory thresholds than men, and this effect is magnified during a woman's ovulatory period. 30. The exact mechanism of such allocation is unknown, but several studies indicate that hormonal, pre-ovulatory control may be responsible.
