A low value of the hormone progesterone on day 21 of the cycle may be an indication that ovulation (exit of the ovum from the ovary) has not occurred and, therefore, it will not be possible to achieve pregnancy.
A low value of the hormone progesterone on day 21 of the cycle may be an indication that ovulation (exit of the ovum from the ovary) has not occurred and, therefore, it will not be possible to achieve pregnancy.