# BBT increases after ovulation > After ovulation, the corpus luteum begins to secret progesterone. The BBT rises 0.5–1.08F and plateaus throughout the luteal phase[[(Su et al., 2017)#^3p5of]] > Postovulatory = consistently higher than prevoulatory temps > With at least one or more reading measuring higher than 37.0 > [[Fertility Awareness Mastery Charting Workbook Lisa Hendrickson-Jack#^izxx4]]