Welcome to BYC! Thank you for joining us, hope you enjoy this place. As CT said you might want to check in with you local state thread over at http://www.backyardchickens.com/f/26/where-am-i-where-are-you
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Congratulations on the eggs! On average it will take about 24-25 hours for a chicken to produce an egg so I would say those 3 eggs came from different chickens. It's not unusual for them to share a box (sometimes even at the same time).
X2 on NorthFlChick's post. It's possible for a hen to lay 2 eggs within a day but very uncommon and physically impossible for a hen to lay 3 eggs in a day.