Should I not have finished work for my whole group?

Our work was getting late beyond the submission, and still wasn't finished. I was getting stress and annoyed so I just finished the last part on my own. Now, we have an extra day and I feel as though I shouldn't have done that because they probably wanted to help or do part of it as well.

How can I explain to them in a chill way that doesn't show my frustration (lol)?

Should I not have finished work for my whole group?
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