How do I actually tell my mother I have my period? Options

[Twist3d]

In an earlier topic, I said I still hadn't told my mother about starting my period last year. Most people said I should tell her, unless she was like the the mom in Carrie xD. So I probably will, but I don't know how. She said anytime I felt uncomfortable to talk to her to call or email my sister.. But I'm not really comfortable doing that. So any suggestions? Oh, and obviously on my part, I'll tell her when I get my period that month.

Edit// I've never actually read the book Carrie. Just heard certain parts of it. [I know not important for this topic]

[takemyhand]

i didnt even know i had it til my mom washed my undies x) lmao.
i came home from my summer job one day and she goes "hey, did you know something?" and i was like "uhhhh.. no.. what?" and she was like "you have your period." i was like "whaaaaat?" xD lmao. then she took them out and showed me and i was like "ohhh... im stupid" lmao x)))