Do evap lines get darker???

Okay so I already posted them I’m going crazy - cramping since 10dpo and spotting since about 11/12dpo with 28 day cycle and period always on time. I took a couple of IC’s. The first was bfn within the 4 mins... however after I checked at about 10 (even though I should know better!!) saw a vvv faint line which I presume evap. After feeling awful and still no proper bleeding took another 2. 1 test didn’t work at all, the 2nd again looked negative at 4 mins but when I checked later had a much darker pink line. My question is would this happen if they are just evaporation lines? Would they get darker and pink? Sending myself crackers. Waiting for toddler to wake so I can go buy a proper test since I’m doubting these cheap ones. I’m feeling exhausted and bloated, cramping has gone off today but brown discharge still ...