I took a cheap test and I see a very faint line. I took some more tests and they showed negative. My app says last weekend

I ovulated and I’ve had a lot of sex everyday since a few days before last weekend, could it be showing from that? Faulty test?? Opinions please! This line showed almost immediately so couldn’t be an Evap line ? I looked at it after letting it sit and the line turned thin and red this morning but it looked like this last night when I took it. I took three tests after this and all were negative ☹️