It's always good to post a link when you are asking about a specific pattern because it helps others help you. Is this it?
I'm not sure why the chart only has 29 vs the 30 CO. It seems like 29 would be the correct number since you want the heart centered, but I haven't made it so I'm not sure. Since the entire project is on the CD I think it would help clear up any any question you may have.