Ovulation Tests will help you determine time when you are most able to become pregnant by detecting rises in luteinizing hormone (LH) which rises just before an egg is released.

 
The best time of day to take an ovulation test is between 10am and 4pm (early afternoon is the best time).  This is because if you take first morning urine you can sometimes get a false positive.
 
A ovulation test is considered positive if the line is the same color or darker than the test line.