12dpo BFN with blue dye

So I've had crazy symptoms that I've never experienced before. Very vivid dreams at 9 and 11dpo, major AF-like cramping all day at 10dpo, off and on nausea since 9dpo. Used up my last two FRER on 8 and 10dpo, tested this morning with a blue dye at 12dpo and got a stark white BFN. No spotting, no blood, nothing. I don't expect AF for another 2 days and I NEVER cramp as early as 4 days before. I'm not sure if it's worth trying again with a pink dye, cuz people normally report false positives with blue, not false negatives. I just feel very off and like I might be pregnant, but I feel so discouraged. We're buying donor sperm and can only afford to try every 4 months or so. This is our second try, last one was in September.