E levels rise and fall within 24 hours so they really don't mean much. What is more important is how you feel, breast growth, body hair, fat distribution, facial changes, etc. I noticed my breasts growing within a couple of months of starting HRT and lots of pain. Increased fat in the thighs and buttocks within 2-4 months, body hair growing slower within days. You should see at least some change at 2 months, IMHO.