Our Black Rocks are just coming into lay for the first time - the eggs are weeny about 1.5 inches long; our Light Sussex, who are in their second or third year lay "normal sized eggs" and our rather elderly RIR lay humungous "ooh yah" eggs (but not very often).
I think this pattern is perfectly normal - the pullet eggs will get bigger over the season and next season, when they come back into lay again, the eggs will be "normal" sized.