You are confusing "L"ibertarian with "l"ibertarian. Most libertarians are not Libertarian Party members. So much jammering on this site about libertarians, interchanging it with Libertarians, and generally woeful ignorance of what libertarians believe, or what I personally prefer "classical liberalism."
You are also likely unfamiliar with Libertarians for Life.
I'm certain there are some pro-Life Libertarians out there, but they are just not what I'd call mainstream (L)'s, if you know what I mean.