You can still get pregnant, if you ovulate before your period resumes that's all it takes, good luck TTC :) be patient, don't stress & have fun :)
HI,
Absence of periods may be secondary to the depo shots. Weaning of the hormonal effects will lead to resumption of menses. Usually ovulation occurs when normal menses return. Also you are young and there is no hurry.
Hope this helps.