8DPO (photos in comments)

I've had a blue line test do that to me before. It was negative but the leftover dye had settled weird or something. This doesn't mean that a future test this cycle won't be positive but it's still pretty early regardless. I'd say retest in a few days closer to your period for a better answer

Definitely depends! I am 8 days post FET and was clear positive since day 6. But with my past I wasn't positive until 10dpo.

Test again in a couple of days!

Those tests are so bad for false positives. I had that happen to me within the time frame. Use a red dye test