Chelsea have dropped points for only the second time this season in the Women's Super League after they were held 2-all at Brighton.
The world's most expensive female player, Naomi Girma, made her debut for the leaders - but came off injured in the second half.
Manchester United are five points off the top thanks to a 2-nil win over Leicester.
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Manchester City are third - for now - following a 2-1 victory at Tottenham Hotspur.
Elsewhere, bottom side Crystal Palace suffered a 1-nil defeat to Liverpool, while fellow strugglers Aston Villa lost 2-nil to Everton.
