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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.
You can ask your doctor to help you with when the conception could have taken place if you are still pregnant. If they were close together you could have a DNA test while pregnant, however it is more dangerous than waiting until the baby is born. Once the baby is born you can have the test done right away. It is just a cheek swab test. Whomever you want tested would need to also provide a sample.