Is it normal to not have your period at 14?
Yes, it's completely normal not to have your period at the age of 14 years old. The average age of menarche (first period) is 13 years old but anything up to 16 years old is considered within normal range.
What is wrong if you've been off Depo for 14 months and you want to conceive but you haven't had a period yet and your hormone levels are normal?
Woman normally gets pregnant on the day 14, if the periods of 28 days duration. On the day 16, if the period are of 30 days duration. That is you get the period after 14 days of ovulation in normal course. That is rare to get pregnancy just after period. But it is possible to get pregnancy just after the period.