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Implantation & Pregnancy Tests

Danielle • Thu, Apr 26

So I am a little confused how FRER test can have such high percentages (99%) of accuracy a few days before your missed period when implantation can happen anywhere from 6-12 days. Supposed you implant DPO 10, then wouldn’t it not show up on a test until like DPO 12 which is 2 days before period (with a 28 day cycle). How can the percentage of accuracy be so high 3,4, and 5 days before missed period when many women might not have even implanted!?