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There are two basic types of DNA testing that can be done before delivery. These include amniocentesis and CVS, or Chorionic Villus Sampling. An amniocentesis is generally performed during the second trimester of pregnancy. Typically, it would take place between the 14th and the 20th week of pregnancy.
Genetic testing is ideally done before you start trying to get pregnant, says Angela Trepanier, MS, CGC, co-director of the genetic counseling program at Wayne State University and president of the National Society of Genetic Counselors.etting screened before you try to get pregnant can give you reassurance (if you or your partner is not a carrier, it's one less thing to worry about when do you get pregnant) or can help you make an informed game plan for pregnancy.