Though now that you say so, that does sound convincing if, in the first place, you prioritised yourself above your child... or if you disputed the definition of the fetus as being a person.
The implications of that raises some tough questions on what being libertarian means. Do we think for ourselves above others, i.e. self-preservation? Do we consider the pregnant woman's relationship with the fetus as being one of dependency, cooperation or a single individual? Is considering a preganant woman as a single individual a form of collectivism, or genuine individualism?
I believe in the freedom to be what we choose to be.