thanks Mary G. and Hurdity for your reply.
I have only scant bleeding with my regime, and not even every month. Hence my conclusion that i might need to increase the estrogen dose. I did try to add testosterone (androfeme) a couple of years ago but had to suspend it after 6 months due to its side effects (severe acne, hair thinning, sex libido that was out of control). We are all different and that's what makes finding the right dosage and combination of hormones so difficult. I am very thin, with little body fat, so maybe i don't absorb estrogen well. I settled on 10 days of utrogestan (100mg) because i i take it for longer, the side effects become unmanageable (slow digestion, bloating, constipation, headaches, acne, insomnia)