Hi Chloe,
We were in the same situation for my husbands passport.
We too never heard anything until Thursday night and that was a refusal for an upgrade and we are flying tomorrow.
Please dont listen to people who have been successful and put you off visiting the passport office.
They are organised in such a way that they will see you for an enquiry and help in any way they can.
we were lucky enough to recieve ours on the same day as queuing and the staff were immenseley supportive and helpful . Wishing you good luck and get there early x