Budgeting is not my strong point. I don't read things properly and I tend to do an auto flap like chicken first.
So I thought I would include what the pip letter actually says.

My last payment from DLA was 5 February.
Decision made for pip award 23 February.
They can award me from 28 March.
First payment is 19 April, what they owe since 28 March.
We will then pay you four weeks in arrears on a Thursday.
Why is the award not starting from the decision, making the first payment March.
The amount payable is wrong, it should be £174 and its £184.79. This suggests something has gone a little wrong with their working out.
It's sort of reading that I won't have any money for ten weeks. That's me not working it out properly right?