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Wondfo verrrry faint vs FRER

I took a FRER at 9 dpo and got a bfp. I got a blood test at 11 dpo due to my previous loss and my hCG came back at 47. See below for my FRER and Wondfo comparison at 47 hCG.

Anyone else have a vvfl on a Wondfo strip test and very clear line on FRER? I know they’re different sensitivities but it still seems so odd to me that it still would be soooo faint when hCG is at 47! (Wondfo sensitivity is supposed to be 25!) If you have these tests, beware they may not be very sensitive!!