Katie Poore felt defeat was harsh on Pompey Ladies on Sunday.
The Blues conceded in the 93rd minute to lose 2-1 at Lewes in the FA Women’s Premier League southern division contest.
Centre-back Kaylee Schumann-Edwards had given Pompey the lead.
Lewes scored to level after the break and then snatched the points.
‘A draw would have been a fair result but we didn’t get it,’ said Poore.
‘It’s very frustrating especially because we went ahead.’
Pompey started brightly but then Lewes forced Blues keeper Sadie Blakely into a superb save.
She came off her line to deny the home side from a one-on-one opportunity.
Pompey then hit the front on 31 minutes.
Schumann-Edwards profited from a clever corner routine as she was in the right place for a simple tap-in.
The Blues led at the break but were pegged back just seven minutes into the second half.
Catherine O’Hagan’s looping shot, from 20 yards out, was too good for keeper Blakely.
Pompey looked the more likely winners in the latter stages.
Winger Lucy Quinn hit the woodwork as she was denied a fourth goal in four league games this season.
But Lewes snatched the victory when Naomi Cole finished superbly in stoppage-time.
The two teams meet again on Sunday in the league cup.
Pompey are at home this time and will certainly be on a mission to gain revenge.
Poore added: ‘We will put things right next time.’
Pompey Ladies: Blakely, Simmonds, Schumann-Edwards, Murphy, Bazan, Frampton (Badger), McGee, Rutherford, Quinn, Wilson, Hillier. Unused subs: Cox, Hunt, Crabb.