Start Pills a Week Late?

Okay so I'm about to start the pill for the first time. My Dr and I looked ahead and my period was to start in the 20th so I'd start the pill Sunday the 25th and I wouldn't have my period for my wedding and honeymoon August 5th-12th. However my period came yesterday meaning I should start today and my period will come on my honeymoon. 
Can I wait to start it until next Sunday? That way I'll still be on track to not have my period during my honeymoon? 
Any suggestions are appreciated. Need to know if I have to start today...