I'd contact your local pharmacist and ask for advice.
Changing from a progestogen-only-method (progestogen-only pill, injection, implant or a progestogen-releasing IUD)
You may switch any day from the progestogen-only pill (from an implant or the IUD on the day of its removal, from an injectable when the next injection would be due) but in all of these cases you must use extra protective measures (for example, a condom) for the first 7 days of tablet-taking.