Did your cycle bounce back to how it was before pregnancy?

I've always always had a 28 day cycle,ovulate on day 14. I got my period on the 10th and yesterday on cycle day 20th I got dark brown blood. I've never bleed for anything other than a pregnancy but I've read that ovulation can cause this so I took an opk and it's positive. hcg can also be picked up with this test though!!!! I'm so lost

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