Not necesarily. You can be pro-choice and still consistently believe abortion is wrong if you also believe that God is the only one entitled to punish or prevent a decision to abort because He has not given man the tools to prove that abortion is wrong.
He proves it to you, and He requires adherence from you...... but He doesn't want you to influence the society you live in with your own voice in protecting that society from the very same moral wrong.
I still think you are in danger of subcribing to an objective moral code while saying that it doesn't exist. Beware the sophistry that may lurk in such a position.
Nice meeting you by the way. I'm in Central coastal Maine, Where are you writing from?