brown chalky discharge that lasted for 3 days

Hi,
Welcome to ehealthforum,
Urine pregnancy tests can show false negative results at times hence they cannot be relied upon for accuracy. Urine pregnancy test kits are calibrated ones, so unless the hormone levels in urine reach a certain level, they do not show positive results. Blood/serum HCG level estimation is accurate. Your symptoms (brown discharge, delayed periods, abdominal cramps, headaches, swollen breasts, blue veins over breasts, nipple pain & sensitivity) could be suggestive of possibility of pregnancy.
Periods can get delayed for upto 10 days due to stress, changes in sleep, eating habits or lifestyle, hormonal imbalances etc. 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, visit your doctor/gynecologist for examination (to look for signs of pregnancy changes in body) and getting a blood HCG test done (to confirm/rule out pregnancy accurately). Take adequate rest. Drink plenty of water. Maintain healthy diet. Avoid caffeinated and carbonated beverages.
Take care.

Thank you Im hoping for the best because we having been trying for awhile to become pregnant...