Hi dear and thanks for your query.
Most of the time, women should begin taking the pill on the due date of their next scheduled Depo-Provera
However, the specific start date for taking the new birth control varies depending upon circumstances, and some I may instruct a woman to begin taking the pill before or after that date.
If you are going to take the birth control pill after the next scheduled injection date, you should talk to her doctor about backup methods of birth control or avoid sexual intercourse during that time.
ALL THE BEST