Evaps from hell

Ok so I took the test on the left last night and after 10mins it was negative. Woke up the am and it was positive (evap) took the test on the right today and within 10 mins it was negative but after 35 mins faint line( looks darker in person) these are both Walmart 88 cent brand. Has anyone else has this issue with dark Evaps like this and were you actually pregnant. 13dpo af supported to start in 2 days.