welcome to HCM.
when did you have those abortions?
if they are in 1st trimester then possible causes are-genetic or chromosomal abnormality,endocrine disorders like luteal phase defect,thyroid
if they are in 2nd trimester thencervical incompetence is the most imp cause.other causea are autoimmune disorder like antiphospholipid antibodies
,blood group incompatibility
consult your gynecologist for the cause of it. sperm count