how to protect myself

First, you should consider filing a claim with Arizona's Dept of Health Services Putative Father's Registry: http://www.azdhs.gov/documents/licensing/vital-records/correction-paternity-claim.pdf  If Mother places the child for adoption, you should be given notice of the action.  A DNA test can be done at that time to determine if you are the biological father.  Or, you could waive the test and state that, regardless of whether or not you are the biological father you are waiving any and all rights you might have.  A second choice is to file a paternity action after the baby is born and request that a DNA test is done.  A third choice is to talk with mom.  Ask for a DNA test to be done as soon as the child is born.  A DNA test should be done through an authorized laboratory.  They will require identification from mother and father and will take swabs from father and child, and if requested, mother.  The cost can be about $400.  If ARizona's DES will do the test, the cost may be significantly less.  "Home" tests are not accepted by the Court.  NOTE:  if you sign an acknowledgement that you are dad and your name is put on the birth certificate -- you become legal dad and will be financially responsible.  It does not matter if you are not the biological father.  Once you are identified as legal father you can seek to establish legal decision making, parenting time, and support.  The above is a brief summary.  I typically take about an hour to give an overview of the laws regarding what you are asking about.  Call for an appointment if you would like more information.  Marie Zawtocki 480-655-0733