A positive blood test will usually show a positive result 3 to 4 days after implantation, or roughly 9 to 10 days after ovulation. For a home urine test, however, a positive result will not be visible until a week after implantation or until you have a missed period. positive blood test will usually show a positive result 3 to 4 days after implantation, or roughly 9 to 10 days after ovulation. For a home urine test, however, a positive result will not be visible until a week after implantation or until you have a missed period.