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.