Am i going to get my boss in trouble?

i changed my work availability at the retail store i work at from after school hours to all day last week. tuesday and wednesday i am scheduled to work from 8 to 11 am, and technically wednesday is my last day of school, so i would have to cut my morning classes those two days to do my shifts. the reason i did this was because i've completed all of my work and exams for this year in the classes i'm skipping for work, and it basically feels like the end of the year already. in addition, there was a lot of competition for the new schedule that required me to skip a couple classes, so i felt i needed to jump on it as soon as possible, which i did. essentially what i'm worried about is something crazy happening like my bosses getting fined or in trouble in some way for working me during school hours. what should i do? i don't want to call and be like yo i can't make it in tomorrow or wednesday i secretly have school.