Is it normal to be cramping when pregnant and having implantation bleeding?

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I'm currently 3 weeks pregnant and I've been expensing mild cramping the past few days but right now it's increasing the intensity. It almost feels as painful as when on my period. Last night I experience some brown discharge and this morning I notice implantation bleeding. This is my second pregnant and with my first I didn't have any blood until the day my contractions started.

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