I've been taking Contraceptive for 2 years, and my period never came ...

I've been taking Contraceptive for almost 2 years, and my period never came, and my son at that time was a baby. I stopped breastfeeding for 1 month and started to get some little things down, is it normal? For what I know this injection is 03 months and do not menstruate. Could you tell me if it's normal?
Expert answer:

Small bleeds that sometimes last for several days are a common occurrence in that you use Contraceptive.

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