... quite funny ;)
You can get them almost immediately. The most common is nausea. What is it you feel?
You're injecting a large dose of hormone (progestogen) into your body, and therefore, as the last poster said, you can experience side-effects immediately. It tends to interfere with menstrual bleeding patterns virtually straight away, & it may take your body a little while to get used to the larger dose of hormone, so hopefully in a few days you'll notice things start to settle. Your bleeding pattern could take 2 or 3 shots before settling completely, though.
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