Starting meds update P-UK

I received my 1st lot of meds last week (Tues) and took the 1st dose that day, I've been expecting a check up form to fill in from P-UK but noting in my notes yet.

Was I supposed to tell them I'd received the meds and started them?

I've triple checked my previous notes and no where says I must tell them when I start them, it just said start them asap once received. So I assumed they'd get an update from DPD about delivery and assume I'd started them and send the form, but now I'm worried I should have told them when I started.