Oooerr Michelle! This is my first month of using OPKs!! Could that be an omen

Good job @ having a play, Kerrie! You use them starting from about CD10-12 until you get a positive (where the line shows up as strong or darker than the control line - if it's not as dark then it's a negative). Once you get a negative again (because you can get 2 positives in a row - one day after the other) you stop using them