Public service announcement:
If you're on estrogen and you take a multivitamin or if you take biotin to make your hair and nails healthier, it's ABSOLUTELY ESSENTIAL that you stop all of that stuff for at least 3, and preferably 4, days before you get your blood levels checked.
Biotin is the chemical they use in the estrogen level test, and if you've got a higher-than-normal amount of biotin in your bloodstream, your labs will come back saying you've got much more estrogen in there than is there in reality.
If you want accurate results, take a break from the multivitamins!