Compounded sema vs Ozempic

I started off with sema compounded from a med spa and had good results. My endocrinologist switched me to Ozempic and I seemed to have gained back without changing anything else. My concern lies with how it was prescribed. I was given a 2mg pen but was told to dose it out as .5 based on the number of “clicks”

Does anyone else take it this way? I feel like I’m not truly getting a .5 dose because it’s not compounded to be taken this way, it’s only meant to dose at 2 units. 18 clicks of a 2mg pen(what my endo is saying would be .5) doesn’t act the same as compounded sema at .5