Has anyone had a faulty test?

Kadie • :)
Has anyone had issues with faulty pregnancy test? I took two and they are two different brands both faint positives but I took two more a digital and a first response I got negative. I did take them when I was suppose to so I know that's not the problem. I'm not sure if the first two are faulty or something is going on with my body right now.. so confused. Could really use some input please. I don't have a drs appt until the 17th to make sure things are good but I'm getting impatient.