Well, I don't think it's nothing. It's something that you are aware of. I do similar things to what you have written above and for me, it is anxiety related. I mean, it's understandable that you check that you have taken your birth control as that is important, right. You might find physically writing down somewhere that you have taken your pill, maybe in a diary/journal, then you know you did it. Please see your doctor if you feel this is starting to control your life.