Helpppp, about know when your getting a 6pack?

Hey im 13 and a girl and i need serious help, ive been wanting a sixpack so the last 3 days ive been working out!>>> not ive noticed a line inbetween my ribs just about my belly button, does this mean im getting one...? its like a dent line in the middle, and i didnt have it before my worksouts, i got it after please helpppp! xxx and p.s anytip for me getting a 6pack, like wot do i do xx thankyou