This isn't just a horrifically-misleading headline, it's straight-up false.
The bill originally was written to directly establish personhood of a fetus, but Democrats got an amendment in that keeps the "pregnant mothers get to use the carpool lane" part, without the language that establishes personhood for a fetus. They literally called the Republicans' bluff on "this bill is about supporting mothers", by making that specific. This caused one Republican to retract his vote, because the amendment "guts the pro-life purpose of the bill".