I Missed My Period For 2 Months But Suddenly It

I missed my period for 2 months but suddenly it happened a couple of days ago. 2 days into it, a white mass about the size of a blueberry passed and I was wondering what it may be. I've looked up images of early miscarriage and none looked like mine. I'm not sure what it is, but after passing it, my period stopped. Only little drops of blood. What could that white piece be? Please help me.