How long after implantation will I test positive?

After implantation, hCG levels start to rise, doubling approximately every 48 to 72 hours. With a sensitive test, you might get a faint positive 1 to 2 days after implantation. However, a clear positive result on most standard home pregnancy tests is more likely 3 to 4 days after implantation, and a definite positive is almost certain around the time of your missed period (7-10 days after implantation).