Pregnant woman at 38 weeks experiences regular, painful contractions. What phase is she in?

Parturition

The correct answer is Option (3) -  Parturition

Explanation:

• At 38 weeks, regular painful contractions indicate the onset of parturition (childbirth).
• Implantation occurs 7 days post-fertilization (early pregnancy).
• Placental formation is completed by the end of the first trimester.
• Lactation begins postpartum (after delivery).

Key Concept:

Parturition is triggered by oxytocin-induced uterine contractions, leading to fetal expulsion. 38 weeks is full-term pregnancy, and contractions signify active labor.