I was wondering.... And i'm kind of scared... But does anyone know about face clensers/astringents... Medicated acne face washes... Do they effect the way your birthcontrol works?

I'm worried because I know that certain things that are medicated can make birth control work less.... And everyday I use st. Ives face washes that are medicated (acne prone skin)

any input on this? Am I to worry? Or should my birth control be working okay still?

Thanks.