Final answer:
The nurse should help the adolescent obtain a provider for prenatal care first. If there are concerns about genetic conditions due to age or family history, a genetic counselor can assist in risk estimation for genetic or chromosomal disorders.
Step-by-step explanation:
The nurse's first and foremost action in dealing with an adolescent facing an unplanned pregnancy should be to ensure that the client obtains a provider for prenatal care. Prenatal care is crucial for monitoring the health of the mother and the developing fetus, addressing any complications that may arise, and providing the necessary guidance and support throughout the pregnancy. In certain cases, when there is concern about genetic or chromosomal disorders due to factors such as maternal age over 35, paternal age over 55, or a family history of genetic disorders, the nurse might also suggest that the client consider consulting with a genetic counselor. A genetic counselor can help estimate the risks of genetic or chromosomal disorders to their future offspring and offer information and emotional support.