Yes, if you need them for contraception or menstrual regulation to prevent excess bleeding. There is no evidence that it is harmful to take them at altitude, although on theoretical grounds, estrogen-containing oral contraceptives may increase the risk of blood clots higher. Certain individuals with a history of blood clots or a family history of clotting problems (i.e., having a susceptible genetic makeup) may be at an increased risk for blood clot complications. These are more likely to show up in the first year of oral contraceptive use. So beginning the estrogen-containing drugs with no previous history of use and going to altitude soon after is probably risky.