Maternity Allowance - Agency Worker

[JMD7]

Hello,
I'm 12 weeks pregnant and trying to get my head around maternity allowance.
I work through an agency so I will be claiming through jobcentre.
Does anyone know if the working weeks calculated need to be through one agency or can it be multiple.
Also, the weeks calculated, do they have to be full weeks of employment?
I have worked some part weeks and some full weeks, I'm pretty sure I will have worked 26 weeks out of 66 weeks before the birth.
Thank you :)

I am not an expert, but have just completed the application form for MA. So, from that I would say that it doesn’t need to be through one agency and it definitely doesn’t need to be full weeks (I was working p/t). Might be worth downloading the form and guidance to see?