Pregnancy: Unfortunately, the obvious answer is pregnancy. Other than that, natural family planning is hormone free, device free, and prescription free.
Answered 9/28/2016
6.3k views
Tricky: Natural family planning is not the most reliable form of contraception. Honestly, it is one of the least effective forms of birth control. Strict attention to when your body is ovulating is key and this can take a lot of time and body awareness. Even then, ovulated eggs can survive for days in the female genital tract, as can sperm/semen.
Answered 7/20/2012
6.3k views
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