Micha Østergaard competed for Denmark in 100 & 200 m butterfly and as a member of the nation's 4 × 200 m freestyle relay team at the 2008 Summer Olympics in Beijing.

[3][4] On the first night of the competition, Østegaard closed out the field to last place and twenty-eighth overall in heat six of the 100 m butterfly by 0.07 of a second behind Slovak swimmer and five-time Olympian Martina Moravcová, dipping under a minute barrier at 59.10.

[6][7][8] Østergaard also teamed up with Louise Mai Jansen, Julie Hjorth-Hansen, and Lotte Friis in the 4 × 200 m freestyle relay.

[10] She also helped her Danish team (Jansen, Hjorth-Hansen, and Friis) to dip under an 8-minute barrier and broke a new record of 7:55.56 in the 4 × 200 m freestyle relay, but finished in twelfth overall from the prelims.

Following the 2008 Summer Olympics in Beijing, China, Østergaard enrolled at Copenhagen Business School, from where she finished her BA in Intercultural Market Communication.