ovulation method การใช้

Two well-known mucus-only methods are the Billings ovulation method and the Creighton Model FertilityCare System.
John Billings and his wife Evelyn, devout Catholics then developed the Billings ovulation method, which relies on the observation of cervical mucus to detect fertility.
Betts'research calls attention to the way in which the ovulation method became institutionalised in hospitals and birth clinics that received funding from Catholic-affiliated institutions.
In the late 1970s to mid-1980s, Betts examined the effectiveness of the Billings Ovulation Method of contraception, colloquially known as the ovulation or rhythm method.
Betts notes that despite the introduction of more effective contraceptive methods in 1971, even in the late 1970s, Government funds and facilities were still promoting the ovulation method of contraception.