How many days after implantation bleeding can you test?

If you experience implantation bleeding, which is light spotting that occurs when the fertilized egg attaches to the uterine lining, you should wait a few days before testing. Since implantation bleeding happens around the same time your body starts producing hCG, its best to wait at least 3-4 days after the bleeding stops to allow hCG levels to rise sufficiently for a reliable result.