I took 3 Wondfo tests last night and all show a line (fairly faint, but also I don't have to search for it) - I thought it was unlikely that I'd be pregnant as I didn't even think I ovulated this month and so I took one with water (second picture) which was completely blank.
However, I took an early clearblue digital today (the flashy red one) and it says not pregnant, so could this just be a bad batch of Wondfo? I'm pretty sure both are meant to pick 10miu up.