acne and birth control

i just started taking mylan birth control, does anyone have any info on whether or not this will help or worsen my hormonal acne that i get before/on my period? also, my doctor said not to rely on it for actual birth control which i don’t understand. maybe it’s a low dose bc i’m only using it for period reasons? i’m not sexually active and i’m smart enough to use a condom along with it anyways so it’s not an issue but i’m just wondering what the deal is.