Everything you need to know about health in Chile.
Feminine Hygienic Products
Cruz Verde and Farmacia Ahumada: Both of these are pharmacies located on every other street corner in Valparaiso and Vina del Mar. You can also try Jumbo, Lider and Santa Isabel, which are grocery stores found in both cities as well.
Birth Control is hard to find. Condoms are easy to find, but generally untrustworthy. You can find them at Cruz Verde and Farmacia Ahumada if you want them though.