The Nurse Is Teaching a Prenatal Class for Mothers with a Past

The nurse is teaching a prenatal class for mothers with a past history of drug abuse.What factor would the nurse need to emphasize about the first trimester of pregnancy?

A) There is very little chance of the fetus being affected by teratogens during this phase.
B) Teratogenic agents during this phase do not cause severe malformations in the fetus.
C) Teratogenic agents taken during this phase can lead to structural malformation and spontaneous abortion.
D) This is the preconceptional period of the pregnancy.