Usually a period happens between the ages of 12 and 15 but it might be a possibility. But I do not think its likely since puberty is over
If you have not gotten your period by the time you are 17-18yo you should see a doctor.
21 century
21 days
The age at which a girl will have her period for the first time varies from one person to another. On average, a girl will get her period for the first time between the age of 11 and 14.
The gestation period is 19-21 days from the time the tiels start sitting on the eggs.
On average for between 14 and 21 days.
Neogene Period
When you stat menstruating for the first time
Chapter 1 - 7 The Jerusalem Period Chapter 8 - 12 The Palestinian Period Chapter 13 - 15 The Asia Minor Period Chapter 16 - 21 The Grecian and Macedonian Period Chapter 21 - 28 The Roman Period.
28 days
Day 21? After the first day of your last period or 21 days after your missed period? Either way, a blood test should reveal a + or - result sooner than a hpt.
21 days after the first day of your last period usually
It usally takes 21 to 35 days. 28 days is average.