jenny- depending on the type of opk you use, there will either be two lines or a smiley face for the line test ones, it is not a positive result until the second line is as dark or darker than the control line!! a faint line is a negative when it comes to opks. i prefer the smiley face ones because they leave no questions!! an hpt, however is positive if there is any line at all, no matter how faint.