Few important information has been missing in your question. Why was misoprostol taken is it for termination or for incomplete miscarriage. If for termination, was Mifeprostone taken. What was the dose of misoprostol, was it 800 mg. Did you bleed with cramps post misoprostol if so then what was the time duration between misoprostol and
pregnancy test. If less than a week I would repeat the pregnancy test in two weeks. If not you can do a couple of
beta Hcg levels in blood to assess for a drop. If levels are high or increasing its better to consult a gynaecologist in person to take things further.