Each day starts when the sun comes up, and the next day starts when the sun comes up again. Days go from sunrise to sunrise, NOT FROM MIDNIGHT TO MIDNIGHT. So if you mean you did it at 2:30am after the day of Friday, but before the sun comes up Saturday morning, then you did do it on Friday. You did it Friday night. Not the best time to do it, but it does count. So keep going, you haven't made any mistake.