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This type of abortion in which there is brownish discharge and no cardiac activity found is called missed abortion
.It is not necessary to bleed after surgical abortion.if the cavity is totally empty there can be no bleeding but take antibiotics as advised by your doctor.The cause of abortion should be investigated for which certain tests are done like ABO and Rh typing , blood sugar F , VDRL
profile , TORCH test , APA test etc etc, Take the guidance of your OBGYN
for these tests.