Rapid detects levels at 50-100mIU, while Early detects at 6.3mIU.Congratulations and dint freak out!! You are correct, FRER are more sensitive by a long shot than the Rapid.
first response rapid result vs. early result
AF was due yesterday and I tested with first response early result (FRER) and got positive (see below). I just retested today (a day later) and accidentally bought rapid result (FRRR). It came out negative. Is it possible that rapid result isn't as sensitive? I'm not bleeding at all or no spotting.

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