There are practices in the Church that have changed. Altar boys/ altar girls, receiving communion on the tongue/ in the hand, charging interest on money lent, and wearing chapel veils. These are practices. Practices can be changed. Doctrine and dogma can’t change.
Most birth control pills allow conception, and then abort the embryo. The kind that doesn’t allow ovulation is not well tolerated by most women due to the side effects i.e. vomiting, dizziness, etc because they contain high doses of hormones. The Church will never change it’s stance on birth control pills because most forms abort embryos. The pill also encourages people to use each other.
The Church can not approve of Birth control pills anymore than it can approve of abortion.
“A person is a person no matter how small.”