I probably wouldn't be 100% sure about a brand that claims they can detect from 7DPO... does it say what amount it detects? I'd say its too early (P.S. I got a BFP at 10DPO with First Response mid-stream (but I PIAC and dipped instead of POAS lol) and no evap lines on cycles when it was a BFN, so I think they're pretty reliable!).