Ob-Gyn questions? Ask a gynecologist online.
the medication for injectable contraception has to be given only every 3 month (medroxyprogesteronacetate). I would suggest to visit your OB/GYN for it, but as it is an intramuscular injection, you can also ask him to teach you for doing it yourself.
Dr. N. Scheufele
in this case I see no contradiction for you to use the injection method that way, your OB/GYN will confirm it too for sure.
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Thanks a lot, all the best for you,