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Since you had 2 positive test for pregnancy
and one was negative the situation is trick .Since you are bleeding it can be menses and also it can be a abortion
which is more probable in your case as per your history.I would advise you to get an ultrasound
of pelvis to see if you are pregnant and have aborted and a repeat Beta HcG
test to confirm pregnancy.Also please it is high time you consult a Gynaecologist for opinion and the necessary treatment.