Okay, if your last payslip is dated 28th November, you count back exactly 6 months from that date and your payslips and bank statements must cover every single day of the 6 months.
For example:
Last payslip: 28th November
Your 6 months will be:
28th May to 28th November
So, your first bank statement MUST show you were in employment and paid for working on 28th May. If your payslip explicitly states "28th May" on it, then you can use it, but if it's dated after 28th May, you will need the April payslip as well.
Your bank statements must cover the same 6 months, and show the deposit of every payslip you are including.
In fact, it's usually safer to send 7 months of both payslips and bank statements, just to make sure you are covering the entire 6 months, so I would recommend sending payslips and bank statements from:
April
May
June
July
August
September
October
November