Do estrogen-containing birth control pills enlarge breasts?

Possibly: Depends on how much estrogen, the higher the estrogen the more chance it can enlarge the breats but it can also cause other non desirable effects , you should not be taking bc pills to enlatrge the breast, and at your age the lower the estrogen dose the safer, the lowest combo pill is loloestrin , only 10 mcg estrogen- safer for women in their 40s less chance blood clot , ht attack, stroke.