What is going on in this chart?
1) No sustained rise in temperature mean that ovulation has not occurred.
2) Unprotected sex during first 5 days of cycle, and in the evening of days when no cervical fluid is present.
3) Cervical fluid does not reach peak fertility, remains in a sticky, creamy pattern until the end of the cycle.
4) Protected sex during the fertile window. From the first sign of cervical fluid until the end of her cycle. Since ovulation did not occur in this cycle, she has no luteal phase, and no postovulatory infertile days.