Final answer:
Ovarian torsion during pregnancy is most likely to occur in the first trimester and requires immediate surgical intervention.
Step-by-step explanation:
Ovarian torsion during pregnancy is most likely to occur in the first trimester. The torsion can happen when the ligaments that support the ovary become twisted, cutting off blood supply to the ovary. Pregnancy increases the risk of ovarian torsion due to hormonal changes and the enlargement of the ovaries.
Ovarian torsion can cause severe abdominal pain, nausea, and vomiting. It is a medical emergency that requires immediate surgical intervention to restore blood flow to the ovary and prevent further complications.