I've only used these at 12dpo. Anything else feels like burning £5 notes. 3/5 times I've used them I've got a very faint second line within 3 mins. You can always barely see it (I'll attach a photo, but it's even harder there). The first time I got one I thought I was pregnant and then my period came. This time I'm pretty sure I'm not pregnant as I can feel my period on it's way. Does this happen to anyone else? I thought these tests were supposed to be good but then I end up trying to work out if the second line is pink enough rather than visible or not. That or wondering if I'm having repeated chemicals