Taking progesterone five days before your period may delay your period, but you may also experience a period on time.
Progesterone in a woman’s body decreases to a greater extent before menstruation, resulting in hormonal withdrawal bleeding from the uterine lining and the formation of menstruation. Five days before menstruation, if the progesterone in a woman’s body has not yet undergone a physiological decrease, taking progesterone can enable a woman to delay menstruation when her own progesterone decreases and there is still exogenous progesterone to maintain the endometrium from shedding.
However, the level of hormone secretion in a woman’s body will be affected by a variety of factors such as emotions, environment and the woman’s own ovarian function. If five days before menstruation, the level of progesterone in a woman’s body has begun to decrease and the endometrium is about to start peeling off, then taking progesterone will have less effect in delaying menstruation, and the woman may also experience menstruation on time.
It is not normally recommended that women take drugs such as progesterone to artificially interfere with the normal cycle of menstruation, as this may lead to abnormal menstruation. If necessary, the medication should be taken under the guidance of a clinician to avoid adverse reactions.