Periods post partum!

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Hi friends. I’m an exclusive breast feeding mom and I got my period back 9 weeks post partum. It all seemed pretty normal, ended after my 4-5 days per usual. Then, a week and a half later my period started AGAIN. It was really light at first but it’s still going now and heavy 6 days later which is longer than my typical cycles. Has this happened to anyone else? Am I overthinking?

Sincerely- a very frustrated mama!