I don't know what to think?

For the past 2 days I've had really, really faint positive pregnancy test with these cheap amazon tests. I've done about 10 of them and they've all come back with a faint positive. I've done two frep pregnancy tests, both were negative and one cheap Sainsburys pregnancy test with had the faintest line, I had to take it apart to actually see it. 
​I'm 10 dpo, AF is due in 4 days. I don't have any of the normal symptoms. I'm very confused and upset that these cheap tests are giving me false hope. I've never seen anything on them when I've used them before and they can't all be faulty but I don't know why the freps are picking it up if I am pregnant :((( advise please? X