Just as hair loss products can take a while to have any major effects on your hair, correcting hormonal imbalances isn't an automatic hair fix. I recently fixed my problem about a month and a half ago and the hair is still slowly coming back in. Overall I'm not even really expecting anything severely noticeable for another few months anyways. Your body takes a while to let the hair know to start growing again and the hair itself takes a while to start growing too. The hairs that are regrowing on my head are all starting off as the little copper hairs like you said and one by one slowly thicken and darken.
What was this problem that you think you fixed, and how long ago did you make the change?