Two different results on tests

Today is 10 dpo. I have been using both blue and pink dye tests (Walmarts equate , wondfo HCG tests and first response) since 7 dpo. Took a FR 8dpo. Came back negative. Within 3 min I opened it after the results and saw a very faint line (again within 3 min). The next day, I used a Walmart blue dye. It was a faint line within 3 min. I still didn't think anything about it. This morning I took both a pink and blue dye test. Another faint positive with the blue but a BFN with the red. Either I am not producing enough HCG yet or I'm simply not preggers. I have read that blue dye tests shouldn't be trusted but I have also read that sometimes, not even the pink dye ones work on even a 2 month pregnant woman (my sister, yet the blue dyes picked up on it). Everyone is different. My temp significantly dropped this morning so I don't know. Opinions please. Sorry for the crappy pics, I tried my best with this lighting