As the empty follicle shrinks, if the fertilised egg has not implanted into the womb, your level of progesterone decreases. The womb no longer needs to maintain an environment to support a baby so your body needs to reset ready for the next cycle. Any PMT (Pre-Menstrual Tension) symptoms that you have will start to decrease. Without the high levels of hormones to help maintain it, the thick womb lining which has built up starts to breakdown and your body will shed this. This is the start of your period and the beginning of your next cycle.
If the egg has been fertilised and implanted into the womb, the empty follicle is maintained by the increasing level of pregnancy hormone [human Chorionic Gonadotrophin]. It continues to produce estrogen and progesterone for much longer until the placenta is mature enough to support the developing embryo.
#menstrualcycle #GIO #menstrualcycleawareness #periods - 13 hours ago