Anyone else experience this?

I'm sorry if this is TMI, but I am curious if anyone else who has experienced a miscarriage has experienced this. I miscarried on Sept 1st and am currently experiencing my 2nd period since this happened. A couple of days ago I had some extreme cramps and shortly after that passed a large thick mass similar to the tissue I passed when miscarrying. After that the cramps went away and I felt fine, but I was a tad bothered by it. I didn't have a d&c but miscarried naturally so I was wondering if it was possible to still have some fetal tissue in my body almost 2 months later? Dh and I were planning on ttc again this cycle, but I'm not sure now with not knowing what this mass was. Anyone have any words of wisdom they can share?