After beating Maidenhead, AFC Dunstable and Harlow in previous rounds, the Hatters drew Chichester City away.
Luton Town Ladies recorded their biggest win of the season as they dismantled Norwich City Ladies 8-2 at Stockwood Park on Sunday, via seven different goalscorers.
Luton Town Ladies escaped with a narrow 3-2 win at Actonians Ladies despite a nervous climax to a compelling contest.
Match Report: AFC Dunstable Ladies 0-4 Luton Town Ladies
Luton Town Ladies were held to a frustrating 0-0 draw with Enfield Town Ladies on Sunday.