Methode
- Cervical mucus
- Basal body temperature
- Rhythm
- Theoretical : 95-98%
- Use effectiveness : 75-90%
- To avoid or to achieve pregnancies
- No physical side effects
- Not dependent on servise provider or contraceptive supplies
- Inexpensive
- Not effective
- Emotional stress
- who was enough children
- who is unable to observe her fertility phase
- other more reliable methods are still available
- who does not mind if pregnancy occures
- who is able to recognise her fertile phase
- who can not use other methods
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