Hi,
Welcome to ehealthforum,
It is difficult to comment upon the cause for absent periods without examining you. If you are not breastfeeding your baby, you will not have the protection from lactation amenorrhea. If you are sexually active without protection (and if you are not on any regular birth control measures), you can be at risk for pregnancy. Other causes include hormonal imbalances, thyroid abnormalities, endometrial problems, uterine adhesions, etc. The exact cause can only be made out after careful evaluation. Consider visiting your doctor/gynecologist at the earliest for thorough examination and further evaluation to look for the underlying cause for the absent periods that you describe. Treatment as appropriate (based on examination findings and investigations results) would be started to help you regulate your periods. Consider being 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.