Times running out! Help?!

catsi • 19. pro-choice, pro-love.
When can you start changing the time to take your birth control? Currently on my sugar pills now, and I don't start my new pack until Friday. I've read that you can start when you open your new pack but im really not sure. Help me ? 
​I take mine at 3:03 every day at the same time. And I now want to take them at 5:00 because of my work schedule. Is this okay?