Faint line

so I had my period last week, and it was a lot lighter and shorter than usual and I had literally no cramping at all. So after I finished my period I bought an .88 cents test from Walmart well there was a very very faint line almost non existent on it, a few days later I started feeling nauseous after eating some foods, along with a headache and tender breast. So I bought another .88 cent test from Walmart and the line got a little bit darker, I took that one in the morning when I woke up. I just bought another test today and I took it at 9:10 pm and i feel like it has a very faint line but I’m not sure and maybe it’s because I’m testing so late in the but any advice?