Less than 2 weeks: The HCG half life is about 1.5 days and urine pregnancy test should be negative in less than two weeks. If it is positive four weeks after the procedure, that indicates residual HCG producing tissue and would require additional treatment. See this site for more info. http://www.ncbi.nlm.nih.gov/pubmed/2417443.
Answered 6/10/2014
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