Final answer:
The client should return in 3 months for another injection of Depo-Provera.
Step-by-step explanation:
The correct statement that indicates understanding of the follow-up needed after an injection of Depo-Provera is: I know that I will need to return in 3 months for another injection.
Depo-Provera is a birth control shot that needs to be taken every 3 months. This means that the client should schedule their next appointment three months after the current injection. It is important to follow this schedule to maintain the effectiveness of the birth control method.