The most common day for implant is 9dpo, and then it takes another 2-4 days for the hcg to show up in urine. Some women do get early bfps, but that's because they either implant early, implant at a higher level, or double faster. I don't get discouraged until I see a bfn on like 11 or 12dpo, and even then some women still wind up with a bfp instead of af. FXed