DPO and not pregnant?
Although most think that 18 days of high temperature is a sure sign of pregnancy, this is actually not the exact rule . “18 high temps” can also indicate a Corpus Luteum Cyst. The Corpus Luteum doesn’t disintegrate when it should be (when AF is due) because it doesn’t get the right message from the brain (pituitory gland in the brain) because of hormonal imbalance, but stays there and continues on producing progesterone for more than 16 days (maximum luteal phase length) which make the temps stay high, and give all the pregnancy symptoms. The Corpus Luteum is considered in this case as a Cyst until AF comes where it disintegrates with the blood flow. Although TCOYF cites 18 DPO for pregnancy, most other NFP literature uses a 21 DPO rule.
