Hi Kizzy,

It does depend on the brand but usually its 1-2 days but 3 days isn't unhead off. As Sunny_summer was saying, some women can get whats called as a fade in pattern - which is handy because you know that you are getting close, great if you are trying for a specific gender.

If your positives are extremely positive for 4 days, i have to ask is it possible that you could be pregnant? When was your last period? was it a normal period or lighter than normal?