I've not heard of anyone getting a positive under 7 days after sex, it takes 4-12 days for implantation and 3 days for the HCG, given the minimum days for implantation and HCG detected would be 7 days after sex which isn't unheard of. If she tested positive on a test in less than 7 days the child wouldn't be yours. If more than 7 days than it could detect but for most women they don't get faint positives till about 10-14 days after sex since implantation varies for each person.
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