Just got prescribed Mili 0.25 Tablets

I just received a prescription for birth control from PPH, I’m kind of indecisive if i should start taking them and lowkey scared. I don’t know how my body will react to it whether i’ll break out, lose weight, gain weight etc. I’ve never taken birth control before so this would be my first time i’m 22. I’m just not sure what to expect, I understand everyones body is different and reacts differently, just not sure if i should test it out or just opt out completely.