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All answers having "My bad!" as clue:

3 Character Answers:

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DOH

OOP



4 Character Answers:

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OHOH

OOPS



5 Character Answers:

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SORRY



6 Character Answers:

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OOPSIE

WHOOPS



7 Character Answers:

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IGOOFED

IMSORRY

OHSORRY

SOSORRY



8 Character Answers:

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IADMITIT

PARDONME



9 Character Answers:

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OOPSSORRY

THATSONME



10 Character Answers:

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ISCREWEDUP



13 Character Answers:

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SERVESMERIGHT