I always see people asking about the darkness of their lines on their pregnancy tests. and whether or not the brand of the test really makes a difference. I use nothing but cheap tests because I don't want to spend a fortune. I just got a pretty solid positive today at 16 DPO. This photo starts on 12 DPO (top) down to 16 DPO (today) on the bottom. Long story short, be patient. Sometimes you won't get a solid positive that isn't faint until AFTER your period is due!