The Magpies were on the verge of recording a first league win over the Stags since 2005 in front of a bumper crowd that braved the snowy conditions at Meadow Lane.
Kevin Nolan's boys took the lead in the first half through Hawkridge, but the Stags were given the chance to equalise eight minutes into the seven minutes of added time at the end of the game.
Lewis Alessandra's arm was in the box and made contact with the ball, prompting referee Andy Woolmer to point to the spot, and Kane Hemmings made no mistake from 12 yards.
Nolan was furious with the ref's decision, but Hawkridge says the Magpies have no time to dwell on it ahead of their League Two game at Chesterfield on Sunday.
“It won’t be really tough to get over because it’s not the first time it’s not gone our way,” he told the Nottingham Post.
“We just have to keep our head down, keep working and just concentrate on us.
“I am sure it will kick us on because I thought we played really well and we were the better team.
“We just got to concentrate on Chesterfield now. We are building some momentum and we just have to aim to pick up points.”
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