Period 10 weeks pp?

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I'm 10 weeks postpartum and I'm exclusively nursing my daughter doesn't take pacifiers or Bottles ever I am home all day and nurse her on demand why on earth did I get my period so early? What does this mean can my prolactin levels be low? I do have pcos she poops tons and spits up and eat and is happy usually so I think she's getting enough food. My kids are 13 months apart Cuz this happened to me last time too😞😞😞