Don't worry. Almost every kid who went to daycare got sick very soon in his first week. Be prepared to face two weeks of absence from daycare in the first month. After that everything would be okay.
Good luck!
BTW, my daughter went to daycare when she was 10 months old and couple of her classmates at that time went to the daycare when they were just two-month-old. Not a big deal!
You know me if you knew me. You are not required to know me if you did not know me.