FYI- Faulty FRER

I am very early pregnant and have had chemicals in the past so I've been testing daily and making sure lines get darker. I had a frer turn up bfn after a few days of getting bfps . I of course freaked out and thought we lost this one but thank God I had another test that I took right away and was bfp. Frer has always been my fav but now I will defiantly double check if something seems off!