Pill timings help!!!!

I've been on the pill for a week and I am only on it to regulate my period and make it lighter, however I haven't been taking it at the same time every day. I misting take it at 10:30 in the morning but I few time so forget and could only take it after school at 5:00, is that really bad? Will the pill not work effectively if I I keep on doing this like every third day??? Or does it not really matter