I've seen a lot of questions about this

Cheyenne • Had our beautiful baby girl five days early on June 18th❤️❤️❤️❤️
I've seen tons of posts about who's gotten a BFP at however many dpo. I came alone this site about a week ago and I check every day! It tells you all the stats for prego girls who tested! And only the pregnant women's results are recorded so if it's a negative, it's a false negative! You can choose any number of days past ovulation and see the stats. It shows from very faint positive, to strong positive, to blood tests, false negatives, evap, etc. Hope this helps some of you with the wondering when to test! :) 
http://www.countdowntopregnancy.com/pregnancy-test/dpo-chart.php?dpo=15