I am 13 week pregnant doctor said that baby hearth...

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absent fetal heart beat in 13 week of pregnancy is sign of feta death which needs medical abortion .there are many causes of fetal death in the first trimester like :
-congenital infection 
-chromosomal abnormality 
-endocrinal disorder 
-antiphospholipid syndrome 
-idiopathic 
there is no need to investigation if the first fetus died ,investigation are done after the three fetal loss .
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