Yeah, I mean this comes down to when you consider the fetus as being alive.
Is it at conception? Is it 3 months? Or is not until it's actually out of the womb and takes its first breath?
Your definition of "murder" will depend on what your definition of life is.
I don't think you can really legislate or tell someone what their definition of life is, or should be.
I just don't believe that a fetus is the same thing as an actual baby.
And although it isn't as common nowadays, you can have complications in a pregnancy that can harm the woman's life. So your life is actually on the line, it isn't just the potential baby's life at stake.