Help Me Now I’m literally dying

OK also my period is late by two days by I can feel it coming. I’m afraid that during class or something all of a sudden I get it. I was hoping to get it during Memorial Day weekend, that way by the weekend was over the period would be half over, but unfortunately, things didn’t go the way I planned lol. Please give me advice on what to do if you have a period during school because I’m totally not prepared... and what do you do if your pad leaks? I just started my first period a few months ago and I’m only 11 (yeah I’m just gonna say it but even 11 year olds get periods.) and my sister moved out from home so I have no one to ask about my periods please help 😭😭