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The Billings ovulation method is a method in which women use their vaginal mucus to determine their fertility. [3] It does not rely on the presence of ovulation, rather it identifies patterns of potential fertility and obvious infertility within the cycle, whatever its length. Effectiveness, however, is not very clear. [3]
Similarly, Ishikawa and colleagues found that ovulation inhibition occurred in only a "proportion" of cases with 300 mg/day oral progesterone. [170] Despite the incomplete inhibition of ovulation by oral progesterone, no pregnancies occurred in the two studies, although this could have simply been due to chance.
It is in fact possible to restore ovulation using appropriate medication, and ovulation is successfully restored in approximately 90% of cases. The first step is the diagnosis of anovulation. The identification of anovulation is not easy; contrary to what is commonly believed, women undergoing anovulation still have (more or less) regular periods.
Urinary ovulation prediction kits are typically found over-the-counter and there are many brands to choose from. This test measures the amount of luteinizing hormone, a hormone that increases just before ovulation, that is in the urine. Before ovulation, the luteinizing hormone levels dramatically increase; this is known as the "LH surge".
If she has an unusually early ovulation, calendar-based methods will indicate she is still in the pre-ovulatory infertile phase when she has actually become fertile. [16] Finally, calendar-based methods assume that all bleeding is true menstruation. However, mid-cycle or anovulatory bleeding can be caused by a number of factors. [29]
The beginnings of sexual arousal in a woman's body is usually marked by vaginal lubrication (wetness; though this can occur without arousal due to infection or cervical mucus production around ovulation), swelling and engorgement of the vulva, and internal lengthening and enlargement of the vagina. [10]
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