Thanks for the query.
After complete abortion
also it will take some time for the beta HCG
levels to come down to zero levels.
So the urine and blood tests can show positive results till that time.
The period taken for reduction of value depends on many factors like gestational age
at which abortion occurred, beta HCG levels at that time etc.
So you wait for two more weeks and then repeat the blood test, possibly by that time levels will decrease.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429