I had undergone an abortion by medicine before 10 days, still the pregnancy kit shows positive?

Two possibilities: If it's only a few days after the medicine, the hormone levels could be decreasing over time. A home test only checks to see if there are any pregnancy hormone levels at all, not if they are the same, more, or less than the last home test. Only a blood test can tell you if the hormone levels are going down. Or, the medicine may not have worked and you may still be pregnant. Talk to your doctor.