I think my earliest is 5 dpo because I read that implantation is basically impossible before 4dpo so I decided 5 was ok haha, bloody things are so tempting. I am desperately trying to hold off this month because I go on holiday on 9dpo which I know is possibly early enough but I have been looking forward to this holiday for months and have had a really stressful month so I don't want to spoil my holiday by thinking about a negative. Time will only tell if I hold out, I'm 6dpo today so there is plenty of time to break haha