The hosts were 2-1 up after a first Notts goal for youngster Tyrell Waite and a Krystian Pearce strike which came either side of a cracking leveller by John Fleck.
However, the Sky Blues were rewarded for their late pressure against the tiring Magpies when substitute Franck Moussa secured a point with an 87th-minute equaliser.
Pressley said: "I thought we were excellent, bar a 15 minute period in the first half. We started the game really brightly and had some good opportunities but then we lost our way a bit.
"The second half was as good as we have played for a while and we controlled the game for long periods. I thought we were very unfortunate not to win the game.
"I'm very proud of the performance and of the reaction. It was the final game of the season and to go behind twice and to show that desire is terrific.
"We had a real responsibility to the supporters today as I thought they were wonderful. They turned out in their numbers again and gave terrific support.
"So I'm pleased with our work, just disappointed we couldn't win it."