Hi. I'm so confused.
I was meant to start my mat leave 5/10/15
My due date is 4/10/15 (I just have a sit down job so felt that it wasn't necessary to leave earlier)
From the 28/9/15 - 4/10/15 I was going to use A/l
my last "shift" at work was going to be (I was also meant to work today and tomorrow) 23/9/15 with 2 days A/l that week
Anyway... Had a bit of drama on the 19/9/15 (got all excited thinking that baby was coming early - hes still inside me!!!)
So I decided that I would take my mat leave a bit earlier than expected (16 days altogether.
when I was renewing (in july) my tax credits I mentioned that I would be going on mat leave soon ish and they said to get in contact closer to the due date (so today basically).
Do I need to get anything from my work to send to them along with my matb1 form to explain...
Could I use my last week of holiday to "pay" for my last 4 days that I didn't work (19, 21,22,23??) And would this affect when they consider my mat leave has started even though orally I said it was the 19th... 
What else do I need to do?
My SMP is going to be 90% of my pay...
Any other advice welcome - I'm really confused!!!!!