Conditional Perfect (e.g.: yo habría hablado)

Questions about the Conditional Perfect

Q: Why is it Si hubiéramos ido al doctor, habríamos sentido mejor and NOT Si habríamos ido al doctor, hubiéramos sentido mejor?

When the conditional perfect is used with the subjunctive, be careful to use the conditional perfect in the MAIN clause, and the past subjunctive in the SUBORDINATE si clause.