First period.... HELP!?

hHAHAH ok so awkward, ive learned all about it in health class ik whats going on and why but help... what do i say to my mom? i dont wanna feel embarassed shes cool n all and i love her but what do i say? it just started today (woo-hoo 40 years of crap) what do i say to her about it how do i say it i mean...? i wanna tell her tomorrow morning cuz i gots to goto school really early and she goes to work early and i wanna get it over with and done but no embarassing talk i dont want this conversation to go on i just wanna know what to do no awww u growin up or boo-hoo :'( or anything like that lol she wpuldnt do that probly but still help plz any advie whatd u say to ur mom howd she handle it plz help by tomorrow morning 6 eastern time lol i just want to quickly say mom i was takin a pee last night and there was blood so... lol btw im 13 and usually dont type like this no stereotyping hehe :)