NEW MILFORD — Immaculate High School goalie Lauren Oskam stood between the goal posts with the weight of an entire field hockey season pressing on her shoulders.

After 60 minutes of regulation time and three 10-minute overtime periods failed to yield a victor in Monday night’s South-West Conference semifinal against New Milford, the game went to penalty strokes. After teammate Madison Halas had given the Mustangs the lead in the best-of-five shootout, it was up to Oskam to make one last save to secure the victory.

She did it.

New Milford’s Kelli Souza fired a laser that appeared to be headed into the net, just inside the post. But Oskam dove to her left and batted the knee-high shot away.

Bedlam ensued, as the Mustangs celebrated their 2-1 victory, which landed them in the conference final.

“I just knew I had to be calm for my team, and I couldn’t let any of the goals get in my head,” Oskam said. “I trusted my teammates that they could score, and I just did my job.”

Second-seeded Immaculate was scheduled to face the winner of Tuesday’s semifinal contest between fourth-seeded Barlow and top-seeded Pomperaug in the final on Thursday.

“Coming off a win like that, it feels great,” Halas said. “We made our way through the 30 minutes of overtime, and we made our way through the strokes, so I think we have a good future hopefully in front of us.”

This will be Immaculate’s second trip to the SWC final; the Mustangs lost the 2015 title game to Barlow.

“I’m excited to see what they can do,” Immaculate coach Shannon Horosky said. “They fight their way back from everything.”

Caroline Wax, Megan Coyle and Mackenzy Garden also scored for Immaculate in the shootout, while Kaitlin Siegle, Rebecca Collentine and Julia Venezia scored for New Milford.

Alyssa Malsin had scored unassisted in the 50th minute to put New Milford on the board first, and Celia Preveza tied it for Immaculate off a pass from Halas in the 57th minute.

Both goalies played brilliantly during the regulation and overtime periods, with Oskam making 11 saves and New Milford’s Rebecca Bizier making four.

DEFENSIVE STAND

With the game still scoreless early in the second half, Immaculate defended five corner strokes in succession, with Oskam making four of her saves.

IMMACULATE 2, NEW MILFORD 1

SWC semifinals

IMMACULATE0 1 0 0 0 (4) — 2

NEW MILFORD0 1 0 0 0 (3) — 1

Records: Immaculate 15-1-1-1; New Milford 11-5-0-1. Goals: I—Celia Preveza; NM—Alyssa Malsin. Assists: I—Madison Halas. Shootout goals: I—Caroline Wax, Megan Coyle, Mackenzy Garden, Halas; NM—Kaitlin Siegle, Rebecca Collentine, Julia Venezia. Goalies: I—Lauren Oskam (11 saves); NM—Rebecca Bizier (4 saves).