When am I getting my first period?

Good that you and your mom are able to talk openly about this matter.. Sounds like you are n the verge of a new horizon, meaning your periods.. Starting periods can be quite irregular to begin with until the cycles get established...Noticing your bodily changes is one way to notice that any day now....The white discharge is not your period but is your Hormones all coming together, like your estrogen levels, female testosterone levels and the female pituitary gland in the brain...All very complex we are, but when that monthly EGG is ripe combined with the lining of your womg is ready, then and only then can menstruation occur......It is all up to mother nature....Enjoy the moment by keeping track of all of your symptoms which are clearly indicative of suggesting a monthly cycle, all when Mother Nature says READY..Good Luck !