I passed one too and it was as big as an egg! My doctor said as long as it isn't as big as your fist
Normal to pass clots still, but I was told anything bigger than a golf ball to call the doctor. So it just depends on how big it is.
I was told as long as its not bigger than an egg not to worry. It could also still be afterbirth. (Pieces of the placenta) I passed those until about 3 weeks pp.