Dont worry Steph. I've also had this happen flying Delta (out of PHL) with my 3 kids. There will be others with the same ticket as you. Once they open the gate they will call you up by name and give you a seat. Sometimes they do this for situations where people need assistance (or have an infant on lap).
As long as your ticket says "confirmed" on it you are golden
Have you ever flown from CVG ? This is my first time flying from this airport, hoping its smoother than my experience flying from Louisville!!