I used them last month and my experience was Two equal lines is a positive. It's that unmistakeable darkness of the first line being as dark or darker than your looking for Control. Your result Could be your leading up to ovulation, but remember LH is always present in your urine to some degree throughout the month. Most of the month mine were your result colour, till just before ovulation when they were darker than control.
Test twice a day in morning (around 10am) - not when you first wake up and again in the evening, no later than 7pm. This way you have less chance of missing your surge. I've done alot of reading and my understanding is that it is best detected around 10am. You have to be patient, I was obsessive last month. Thank god for bulk online opk buys!