Can child support take money from your job if u never signed a birth certificate or its not court ordered?

If you were served with a Petition to Adjudicate Parentage and did not file a response with the Court then the Court could allow the other side to proceed against you on a default basis.  That would allow them to present evidence to the court and request whatever relief that they are requesting regarding conservatorship, visitation and access, and support.  Under those circumstances a judge could order child support without you agreeing to pay or having previously signed an acknowledgement of paternity.