Blood clots!?!

Kaleigh • Met my love 1.5.10💕Got married 5.31.14💍Expecting baby girl 6.15.15 👶
I'm a little over 4 weeks hcg levels are doubling as normal but this morning I passed a silver dollar size clot, I pressed on it and it was a dark brown and almost like a paste, then later on today a smaller one same situation. Anyone else experience this before? No cramping or pain, no blood.