Thanks ladies-
I have had a recurrent loss panel that showed nothing to explain why this keeps happening.
My FS doesn't think the US will show anything either.
I doubt my FS will call this last cycle a chemical- by the time I had my BT, my HCG had dropped to 3.... But I was getting faint positives up until that very day.
My FS did mention something about higher than normal progesterone (I think) apparently it can play havoc with your lining?
Back to the drawing board I suppose.