Though his 10 carries were the most he's had in five games, Ravens backup running back Bernard Pierce ran for only 18 yards last week, and that was against the Bears' 31st-ranked run defense, which has allowed 133.9 yards per game. So you shouldn't expect much from him against the Jets' first-ranked run defense, which has allowed 73.2 yards per game, in Week 12.
Starter Ray Rice broke through with 131 yards on 25 carries in that game against the Bears, snapping out of a season-long slump, so the Ravens shouldn't be especially motivated to use Pierce anyway. He's still an attractive handcuff option in Fantasy, but he's not worth starting with Rice healthy.