You cannot reverse the injectable, so if you already had the injectable, you will have to wait 1, 2 or three months (depending on the type of injectable) to start trying. Be patient – sometimes it can take up to 10 months after the last shot for fertility to come back completely.
Still not working? If you want to become pregnant sometime shortly, consider using the monthly injectable, NET-EN (2 months injectable) or different hormonal methods. The pill, patch, ring, or IUD all allow a faster return to fertility than the Injectable. You might also consider a non-hormonal method, like external condoms (male) or internal condoms (female).
Try a different method: external condom (male) ; IUD; patch; pill; ring.

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References:

1. FSRH Faculty of Sexual and Reproductive Healthcare. (Amended 2019). Progestogen-only Injectable Contraception. RCOG. Retrieved from https://www.fsrh.org/standards-and-guidance/documents/cec-ceu-guidance-injectables-dec-2014/