Hello. I Have Been On The Birth Control Mononessa For

Hello. I have been on the birth control Mononessa for about a year now. My insurance company swithced me to Previfem this month. I was locked out of my apartment and took the first pill of my new pack at 10:30 pm instead of my usually 9 pm (1 and a half hours late). I am usually very diligent and take my pill at 9 pm every day. Do I need to use a back-up form of birth control or am I still protected? I'm not sure if under two hours makes a difference.