If a woman is not pregnant and her progesterone level is low, she may have an ovulation disorder. Since the progesterone level in the body only rises after ovulation, if the test is performed after ovulation and the progesterone level is low, it indicates the presence of ovulation disorder in women, who are not ovulating and need to undergo relevant tests to give corresponding treatment. Of course, if the test is performed before ovulation in some women, the progesterone level will be lower at this stage. For infertile women, the progesterone level will also fluctuate with ovulation. Generally, the progesterone level will be at its lowest before ovulation and will gradually increase after ovulation, so it needs to be treated differently.