Hello akimbo,
I am on Evorel and utrogestan. You use the Evorel continuously, but there are different regimes for utrogestan. I assume as you have been given 100 that you are postmeno and to take the utrogestan daily? This is called continuous HRT, the other option is to take 200 daily for 12 days then stop and restart on day 1 again ( of a 28 day cycle). This is called cyclic or sequential HRT. For me, I start the utrogestan on the same day as a new box of patches and take them for 12 days then stop. My period usually comes in the middle of the utrogestan phase. I then start utrogestan again 4 weeks after I last started it so I will have 13 utrogestan phases a year. Some women can do it by date and always start it on the same date each month, they will have12 cycles a year.
When you start HRT you are usually warned that there may be unusual bleeding for a few months and not to worry, however if it lasts longer than a few months to speak to your gp. You should also have been advised to keep to a routine if you can for that 3 months and not try different things. Hope this helps