Hi vintagefiend - I agree re the timing. I would go for 14 days x 200 mg vaginally not orally as a minimum to start with and ensure you get some sort of bleed. Then see what bleed you get. If necessary and depending on your bleed wait another two weeks and take another course eg 12 days x 100 mg. Ideally you should do this under medical supervision to ensure your lining is not overthickening.
The only proprieatry product which gives prog 3 monthly gives 14 days of prog (Tridestra) per 3 months ( 12 weeks) and at double the dose of the same progestogen taken cyclically every month.
Three or 4 bleeds a year may be fine but depends on you, your absorption, your womb lining and your oestrogen dose which is why medical supervision is necessary.
If you are feeling pms-ish well maybe you have ovulated and your period will come naturally but you will still need to take extra progesterone due to the additional oestrogen you have been taking.
Right pain I know but you must look after yourself! Glad you have been feeling generally better
Hurdity x