Sprintec

So I started Sprintec on July 16th, was on the second day of my period. I started bleeding on the 26, took my last active pill that night. I’m on the white pills now but I was wondering if I should take all of them. I have 6 left and I know I probably won’t be bleeding that long. I’ve heard birth control is more effective if you shorten your break to only 3 or 4 days.