10dpo with FRER question

Sarah

I took a FRER with FMU at 10dpo. It was a bfn. Stark white. I know it isn't considered accurate since I was still before my missed af but I'm wondering if anyone has gotten a bfn at 10dpo just to get a bfp later in the week. Not sure if this is being posted in the right forum if not please direct me to the correct one. Thanks!