It’s technically possible if you happen to be one of the very few lucky women who implant on the earliest possible day (6dpo), but it’s not likely. The average woman doesn’t experience implantation until around 9dpo, and it can take 2-4 days after implantation for hormones to increase enough to be detected by a home pregnancy test. That’s why a lot more women get positives between 11dpo and 14dpo than earlier.