If you kill a child that is already born, then that's just normal murder, whether it's yours or not

However, an "unborn child" is different, because it fundamentally relies on the use of another person's body, hence it's right to life is entirely dependent on the consent of the host individual. If you don't want it to continue using your body, then you have every right to stop it from doing so, regardless of whether you initially wanted to be pregnant or not. Surely you agree that another individual does not have the right to use your body without constant consent, right?