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Progressive delay in periods, altered periods, along with symptoms like nausea and abdominal cramps could suggest chances of pregnancy. Wait and watch for your next periods. If pregnancy is suspected, look out for development of any new symptoms. If you do not get your periods within 10 days of expected period dates, or if you develop any new symptoms, or if you get abnormal/altered periods, or if you suspect chances of pregnancy, you should consider visiting your doctor/gynecologist for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately). 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.
Take care.