When does the 3 month waiting period begin in my case?

I have just been awarded LCWRA and wondered when or if I will be given backpay, or when the three month waiting period begins for me? I was in the Support group for ESA until last August (three weeks before my UC claim began) when I had to go back to work after splitting from my husband. I applied for UC later in August 2023 and received payments shortly after and told them of my disability. I wasn't told that I needed a Fit note to prove this, so no form was issued. Eventually, once I had a Fit Note, (issued in Jan but backdated to August) I was given an application form in February, many phone calls later. I had my WCA and received a letter yesterday in my Journal saying I’ve been awarded LCWRA.

I’ve looked at the regulations and it says in Reg 28 that should regulation (41) (2) apply, (weekly earnings that are equal to or exceed the relevant threshold, but also entitled to… personal independence payment) the 3 month period begins ‘on the date which the award of universal credit commences, or if later, the date on which the claimant applies for the LCW or LCWRA element to be included in the award.’

Does this mean for an August UC application that I’ll be backdated to November? Or does the submission of a Fit note still stand from January? I’m quite probably misinterpreting this altogether so would appreciate any help! It's been a fraught process so far!

Many thanks.