Pregnant? or blue moon irregular period?

Hi,
Welcome to ehealthforum,
Your symptoms (lighter shorter and altered periods, pink spotting, low back pain, abdominal cramps, headaches, heavier breasts, milky discharge from nipple) could be suggestive of possibility of pregnancy. Wait and watch for your next periods. Look out for development of any other new symptoms suggestive of early pregnancy. If you suspect to be pregnant, or if periods do not start within 10 days of expected period dates, consider visiting your doctor/gynecologist 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.
The urine pregnancy test (UPT) kits are calibrated ones, so unless the hormone levels in urine reach a certain level, they do not show positive results. They can also show false negative results during early pregnancy. Blood/serum HCG level estimation is accurate. UPT should always be done on early morning first urine sample as the concentration of pregnancy hormone HCG is believed to be highest in this sample. You can also consider repeating the tests after about 7-10 days on early morning first urine sample to see if they turn positive.
Take care.