Hi again ...
as per my original reply you need to wait the 5 days first - nothing you can do really until then, and even if that date passes you should speak to HR / Payrole. I would suggest emailing them the question too so you have a written response (in addition to speaking to them) just in case you need some additional "evidence" at a later date.
I would say dont panic! which is easier said than done I know - but unfortunately this happens to more people than you realise and on a monthly basis - cash flow for most companies is extremely bad at the moment and most of them will pay when they have the money themselves. I know this doesnt pay your bills though! - most banks here in Spain allow up to the 5th of each month for standing orders / debits to be taken out because most companies have always operated on the paying salaries date up to 5 days from the date stated on your contract as "payday".
If you get to 5 days and still have no joy send me a pm and Ill get one of our employment lawyers to talk to you if you like .... Im not a lawyer myself!! - and they can give you initial advice without any charge.
Sue