faint lines on cheapies but not FRER

has anyone else had this problem? I dont know what to think 💔 we had a miscarriage recently and really just wanted this month to be our 🌈 rainbow

walmart. internet cheapies and some blue dye tests (blue dye i dont trust) are saying. faint positives. But FRER is negative... arent they suppose to be more sensitive? 😢 I have a digital that Im gonna take Friday. (AF due tomorrow.