This table outlines, day by day, the window for giving patients their progestin re-injection.  The calendar is based on three-month/15-week dosing intervals with the flexibility of dosing between weeks 11 and 15.

Sources:

1. Pardthaisong T. Return of fertility after use of the injectable contraceptive Depo Provera: up-dated data analysis. J Biosoc Sci 1984;16:23–34. http://dx. doi. org/10. 1017/S0021932000014760PubMed
2. Paulen ME, Curtis KM. When can a woman have repeat progestogen-only injectables – depot medroxyprogesterone acetate or norethisterone enantate? Contraception. 2009 Oct;80(4):391-408. Doi: 10.1016/j.contraception.2009.03.023. Epub 2009 June 13.
3. Schwallie PC, Assenzo JR. The effect of depo-medroxyprogesterone acetate on pituitary and ovarian function, and the return of fertility following its discontinuation: a review. Contraception 1974;10:181–202. http://dx. doi. org/10. 1016/0010-7824(74)90073-0 PubMed
4. Steiner MJ, Kwok C, Stanback J, Byamugisha JK, Chipato T, Magwali T, et al. Injectable contraception: what should the longest interval be for reinjections? Contraception. 2008 June;77(6):410-4. Doi: 10.1016/j.contraception.2008.01.017. Epub 2008 Apr 10.
5. US selected practice recommendations for contraceptive use, 2016. Centers for Disease Control and Prevention website. 1 Feb 2017. https://www.cdc.gov/reproductivehealth/contraception/mmwr/spr/injectables.html.