He expects another call from referee Robert Madley after Andrew Crofts brought down Lee Tomlin and no foul was given, despite protests from the Posh boss.
"I've had six calls the day after a game from referees to apologise for getting it wrong and that's too many," Ferguson told The Sun.
"Tomorrow will definitely be a seventh if he has anything about him.
"It's a clear red card because he's nowhere near the ball."
The draw leaves Peterborough 20th in the Championship, level on points with Wolverhampton Wanderers and Huddersfield Town.