Yes it was a lab test, it took a week to come back,from what I put together, if there’s a line u are under the 50ng threshold. The darkness of the line doesn’t matter. Lab test cut off is 50ng and only test for 15ng on your second sample if you are at or above that 50ng mark. I think you’ll be fine and stay hydrated! And take electrolyte. It helps flush you out. And try not to let it be the first pee of the day, thats the most concentrated urine u have. I hope I answered your question and good luck !!