Chelsea had 33 straight league games without losses, but against table-toppers Brighton, the mighty suite ended abruptly.
At home in the London derby against Arsenal, the Swedish team was once again on the winning track.
Pernille Harder made it 1-0 just minutes into the second half and ten minutes later the Dane extended to 2-0 with a shot from outside.
In extra time, Fran Kirby made it 3-0, which was also the end result.
Uncertain with the national team
Magdalena Eriksson and Jonna Andersson played the entire match while goalkeeper Zecira Musovic did not take a place on the bench.
Tomorrow, a message is expected about whether the Swedish national team trio will join Peter Gerhardsson's squad that will have a camp in Malta or if they will be stopped, which has been flagged in advance.
Crushing goal difference
After tonight's win, Chelsea have a crushing 42-8 in goal difference and are fighting for the league title with Manchester teams United and City shadowing the team in the table.
Arsenal remain four after the loss.