I think one prevents pregnancy. That would be the contraception issue. Deliberately choosing to selfishly accept the “benefits” of an action while ignoring or thwarting the procreate purpose of the action.
The other is deliberate murder of a brand new human life.
Because of the newness of the life, often early murder is sometimes conflated with contraception.
It is unclear whether modern statistics makes this distinction, and with easier availability of chemical murder, may skew the statistics. As noted, unclear whether this is happening or not.