When I updated by iphone with IOS7, my calendar entries did not follow the icloud. I am only showing pre set calendar entries for the year?

When I updated by iphone with IOS7, my calendar entries did not follow the icloud. I am only showing pre set calendar entries for the year and lost all other calendar entrie and it will not take any new entries. They show up in my outlook, but not on my iphone, which they did before I updated my software to the new i0s7