How do I get my iPhone 5s to back up to iCloud?

I just got my iPhone 5s, and I tried to back up my photos to iCloud, but I found that only some of htem backed up when I went to photostream. When I went to photodate, I found that the apps before September 18th (the day iOS 7 came out) didn't back up. Only the photos taken with iOS 7 backed up. I have about two photos that were taken on my old 4S, so I think it's iOS. Anyone have any ideas of how to get those photos to back up? I think it's just a glitch, so I hope apple sees this question. If you're having the same problem, please write that. Could iCloud also be not backing up other things, and I just don't know about it? I have camera roll checked in the iCloud management page. By it, it says 1.5 GB, so I know it realizes there are more photos in the camera roll. What should I do? Anyone know how to fix it? Thanks