When Should I Expect My Period After A Triptoreline Depot Shot?

Hi, i got a Triptoreline depot shot (Gonapeptyl 3,75mg) on cycle day 21. My clinic said i should get a bleed and start ERA test prep 2 weeks later when my lining is shed below 5mm. Now 10 days past depot shot and no period there. When does it come normally? What do i do if period doesnt arrive on time - another month Gonapeptyl? Thank you