Will dhea convert into estrogen?

Yes. Dhea is a male-type (androgenic) hormone from the adrenal glands which can be enzymatically converted to other androgens in your body, which can be converted to Estrogens by the hormone aromatase. Beware of marketing excesses that imply benefits from supplements which are unproven.
Yes, converts into. DHEA is a precursor to testosterones and other androgens in men, and estrogens in females.