During perimenopause, your hormonal balance undergoes significant shifts. In addition to the decline in progesterone (which begins during premenopause), oestrogen levels also start to fluctuate significantly, with an overall downward trend.
Typically, progesterone levels drop faster than oestrogen levels during perimenopause, leaving oestrogen relatively high in comparison. This can result in oestrogen dominance, which is responsible for many symptoms.
As you approach menopause, your periods become less frequent. Eventually, oestrogen production follows the same declining pattern as progesterone, decreasing until the ovaries stop producing both hormones.
If your period has been absent for a year, you can retroactively determine that you reached menopause one year ago. After this, your body enters postmenopause. During postmenopause, the ovaries no longer produce progesterone and oestrogen, and your hormone levels remain consistently low.