In general, the puberty and the menstrual cycle are genetically and hormonally determined and different girls can have different development. In different countries periods are starting at 11 -17 (depending on physical development, hormones, genetics, country location, etc). It is very personal and pre-menstrual "signals" (strange discharges, breast tense, abdomen pain, etc.) can come 1-2 days or 2-3 months or 11-12 months in advance. Some girls don’t have any pre-menstruation "signals". It depends how sensitive are you and how fast your hormones will jump up. Just don't be stressed because stress itself could make a delay. Everything has it’s time. If you would not have your cycle up to 17 – better visit your doctor.
First period usually occurs about two years after your breasts develop and between 4 and 6 months after the growth of your pubic and underarm hair.
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