What is going on in this chart?
1) Long follicular (preovulatory) phase.
2) Unprotected sex when fertile cervical mucus is present. This patch of fertile cervical mucus that was not immediately followed by ovulation is known as a "false peak".
3) Unprotected sex when fertile cervical mucus returns. This was immediately followed by ovulation.
4) These higher temperatures indicate that ovulation has occurred.