There are many kinds of Contraception, not all involve killing babies. Some block the sperms (condom), or change the female hormonal situation by preventing ovulation (e.g. implant), so there's no fertilization. If there's no fertilization take place, there's no baby produced. Abortion, however, obviously involves something to terminate the baby... This is if we believe that life starts from the conception. So, to be sure, there are many contraception that do terminate the baby.
I may be wrong, but I believe Catholic Church allows natural contraception, e.g., "calendar system."
??? Ovulation occurs before fertilization; implantation occurs after fertilization.
All hormonal contraceptives have at least the potential to prevent implantation. (That's according to the package inserts that come with the drug; i.e., according to the manufacturer.) If you believe that life begins at conception (as you should), that means they can, sometimes, work by causing an early abortion.
It is wrong to say that the Catholic Church allows contraception, even "natural" contraception, which is an oxymoron in itself. The Catholic Church does allow for natural forms of birth control.
The Church's teaching included that is it never morally permissable pervert the sexual act, that is to sterilize it which is what contraception does. With natural forms of birth control, there is no act to pervert, wherein lies the difference.
It DOESN'T matter that both can prevent pregnancy. It DOES matter that one involves the sterilization of the act of love, which should always mirror the life giving love of the Father, and the other does not.
Please please don't refer to Natural Family Planning as the "calendar system." I know too many people who thought they knew what a "safe" day was, and got pregnant - sometimes happily, sometimes leading to abortion, single motherhood, or ill-considered marriage.
The calendar is a very small part of NFP>
Mrs
Sometimes called "Vatican roulette".