Is it OK to take Propecia if you don’t need it?

I recently had a FUE procedure done to my hairline. I am not losing hair, I just naturally have a widows peak that I was born with. I was prescribed 3 months of Propecia by my hair transplant surgeon. I feel like I should take it because I heard that younger patients have a higher incidence of shock loss and that Propecia can prevent it. I just don’t want to take Propecia for 3 months and it has an adverse affect on my DHT levels and cause me to lose hair or something weird when I stop it.