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Hi Anon,

Welcome to EmpowHER. 

Irregular bleeding is the most common side effect, especially in the first 6 to 12 months of use.

• For most women, periods become fewer and lighter. After one year, half of the women who use the birth control shot will stop having periods completely.
• Some women have longer, heavier periods.
• Some women have increased spotting and light bleeding between periods.

If you are still concerned, it's best to see your doctor and explain your symptoms.

I've included a link that might be helpful

www.empowher.com/sexual-well-being/content/hit-me-your-best-shot-birth-control-shot

Best,

Daisy