i accidentally posted a picture without the hijab on

i did it by accident but it turns out it was public so about 18 people saw so i dont know whats the ruling on it,i knew i posted it to a story of mine on snapchat but i didnt know it was the public one.i just need some consolation on what i shouldve done.i lied to everyone saying it was a wig from a shop and it was for a prank but am i sinful for lying.i dont want people to see me like that as im known for being the only girl who wears an abaya to high school.was i right or wrong