Me and the mother of my child was charge with conspiracy, and represent by the same court lawyer , who told us to waive the evidence hearing is it i

Maybe.  Even it was that doesnt mean it wasnt good advice.  There is no such thing as an evidence hearing, you may be referencing a preliminary hearing.  In which case the burden is relatively low.  An attorney in a conspiracy case shouldn't represent both parties but more evidence would be needed to know if your best interests were served.  If the attorney was court appointed that is a different level of concern.  You should consult with a local defense attorney who would better know the rules on court appointments and could evaluate the conflict.  If there were issues that person would best know how to act on them to your benefit.