In general, protestant baptisms are valid. if there is reason to doubt a specific baptism, a non-Catholic entering the Catholic Church would privately receive a conditional baptism of the formula, 'if you are not already baptized, I baptize you …". Conditional baptisms are only when there is serious doubt or inability to prove a baptism occurred.
If you begin the inquiry process, you would be considered a baptized non-Catholic. You should talk to your Catholic pastor about any doubts you may have regarding your baptism and he will guide you.