It's based on a woman's observations of her fertility signs: cervical secretions («mucus» or «cervical fluid»), basal body temperature (taken upon waking), and the optional sign of cervix changes. (fertilityawarenessprofessionals.com)
Natural induction methods: nipple stimulation, sex (for Orgasm for woman and semen on cervix), castor oil, enema, blue and black cohosh. (midwifethinking.com)
Your health care provider will insert a speculum into your vagina and clean your vagina and cervix with an antiseptic solution. (mayoclinic.org)