Thanks for the query to H.C.M. Forum.
However there are numerous diseases develops enlargement of spleen.
In this case as miscarriage associated along depletion of platelets.
May be due to ,hereditary spherocytosis
or thalassemia syndromes, that require removal of large number of defective red blood cells.
immune hyperplasia in response to systemic infection ( infectious mononucleosis
, subacute bacterial endocarditis
as IMMUNE THROMBOCYTOPENIA
( DEPLETION OF PLATELETS), Systemic lupus erythromatosis.
In this way complete blood picture with complete history of illness is very important .
Consult a hemaetologist and get his opinion along Gynaecologist.