Sympto-thermal Method

TwoDay Method

Women track their fertile periods by observing changes in the cervical mucus (clear texture), body temperature (slight increase) and consistency of the cervix (softening).

How it works: 
Prevents pregnancy by avoiding unprotected vaginal sex during most fertile
Effectiveness to prevent pregnancy: 
98% with correct and consistent use. Reported 98% with typical use (Manhart et al, 2013)
Comments: 
May have to be used with caution after an abortion, around menarche or menopause, and in conditions which may increase body temperature.