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If after missing/stopping with hormonal contraceptive shot, you have still not had your periods, you should consider visiting your doctor/gynecologist for further evaluation to look for the underlying cause for your absent periods (especially rule out ovarian suppression or failure). Pregnancy chances are also possible in immediate menstrual cycle if your ovulation/fertility has returned back immediately and if you have been sexually active without protection. If you suspect chances of pregnancy (possible if you had been sexually active and if your fertility has returned), consider visiting your doctor/gynecologist at the earliest for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately). Treatment as appropriate would be started to help you. Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest. Maintain healthy diet and lifestyle.
Take care.