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Shorter and lighter periods along with your symptoms (shorter and lighter periods, spotting, abdominal cramps, low back pain, bloating, dark rings around areola, appearance of blue veins on breasts) could be suggestive of possibility of pregnancy. Wait and watch for your periods. Look out for development of any other new symptoms suggestive of early pregnancy if you suspect to be pregnant.
If you suspect to be pregnant, consider visiting your doctor/gynecologist at the earliest for further examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately). Take adequate rest. Drink plenty of water. Maintain healthy diet. All the best.
Take care.