Taking the pill at different times each month

So I have tried switching the times I take my pill each mo both because I either forget to 30 mins later, or get really busy at work and even though I watch the clock and know I have to in the next couple of mins, something happens. So is it ok to do that? Or should it be the same time each month? I heard it's better to take it in the morning because it can keep you up later at night if you do take it later ?