Yet everyone does this every single day, "for convenience". You are giving nothing but platitudes really. Loving parents do things that vastly increase the odds of their children being killed every day for their own convenience. It is an inavoidable fact of life. A person doesn't have value based solely on their biological existence. Humans aren't even independent moral actors until they reach a certain age.
My real point is that any argument premised on full rights from conception has very bad consequences to you and I that are not being addressed. If you ascribe effectively unlimited moral value to ALL people, born or otherwise, then every parent is a criminal of the worst kind. If one doesn't accept the full consequences of ascribing these values to a fetus, then the argument is reduced to moral relativism which I believe most pro-lifers reject (I know I do). These problems have never been properly worked out and make the foundations of the pro-life movement shaky indeed if they cannot be addressed in reasonable manner.