Same urine one fp and one neg???

Rachel • Married to my better half, Mommy to a beautiful baby boy born 11/17/16, baby in Heaven MC 12/12/18, Baby girl Born 10/21/19.

I could possibly be about 7-8dpo right now. Not 100% sure since I forgot to track this months o date. The line showed up within 2 minutes or so(top), so I opened up another one and didn’t see a line (bottom). Could it be a false positive? I tried a couple yesterday (super impatient I know lol) and both were negative. Anyone had issues with wondfo? Gonna test again tomorrow.