Welcome to the forum and Francesca, you'll find the members on here are a friendly and helpful bunch 🙂
i see you posted this 7 hours ago, did you get sorted?
my first port of call would be to try the spare key as this will most likely indicate an issue with car rather than the key.
I'm also wondering whether the battery could be flat. Are there any usual imobiliser lights flashing as normal which aren't flashing now?
the last thing I'd advise is call your break down company.
cheers
Steve