Pregancy Test scare

So I took a clear blue test the other day and it read positive the just 2 days later I took 2 of the cheap dollar HG level tests and they only read one line which leads to negative so I'm kind of freaking out because it makes no sense and after losing one baby and hoping for another just upsetting can the pregnancy tests be wrong or is it to soon for them to direct I'm hoping for some answers?