Ellie
If you google the hormone product you are on and read the manufacturers "prescribing or professional info" which is found somewhere on the first page (it is usually a link to another page), you will somewhere find a graph that will tell you what the average blood level is at steady state ( roughly meaning when the amount of hormone you are metabolizing is equal to the amount of hormone you are receiving, so blood levels stay in a close range). Look for the one that is not the single dose, but the one after multiple doses. You can compare the one for Femoston and the one for Oestrogel. Another way to compare =C max, will be the maximum blood level you get to, usually after 1 dose. Even though that is not a steady level yet, it is a rough comparison of the maximum estrogen you will get with each preparation after 1 dose.
Don't worry about looking up Utro or Ovestin.
A