Finasteride shedding

Dr do you know if finasteride sheds or shrinks some hair during the 2 months stage after a hair transplant?

No, the shed if it comes from finasteride is a sign that it is working. Possibly you are shedding some miniaturized hairs that will regrow in a few months, just a guess.  I hope you were on finasteride when you had the hair transplant as that is critical