Trying to fit sequential hormone therapy in with your own cycle during perimenopause is notoriously difficult because it is based on the myth of the 28 day cycle, and you are constantly chasing a moving target.
Therefore it is worth being aware that this is not your only option, and that there are multiple bleed free alternatives including continuous COCP, the IUS or a continuous oral progestin that can make for a better quality of life during perimenopause.
However if you are keen on cyclical micronised progesterone, the standard advice is to take estrogen alone from day 1 (first day of bleeding) to day 14, and then add the progesterone for the next 2 weeks.
Another option is to ignore your own cycle and just take the progesterone for the first 14 days of the calendar month.
Whatever you find suits, it is important to make sure you are taking the prescribed amount of progesterone every month.
Some women end up waiting until day whatever, and it never comes, or keep starting from day 1 if they bleed and never getting to the progesterone phase, and this starts to cause problems with underuse of the progesterone.