Ordering for the first time

Hi! I'm currently on a four week sample of Zepbound from my doctor and things are going really well and she wants me to continue with a compounded version. My third shot was last night so my fourth and last will be next Thursday. my plan is to stay on the 2.5 for at least another month since things are going well. When should I fill out the intake forms and submit my order for there to be no lapse in meds or getting them too early?