from stopping the pill or could I be pregnant?

Hi,
Welcome to ehealthforum,
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, and can also show false negative results. 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. Drinking lots of fluids or caffeinated beverages in the night before testing can dilute the sample and affect the results. If you suspect chances of pregnancy, consider repeating the test after 7-10 days on early morning first urine sample to see if you get positive results. Stopping with the birth control pill use will not cause symptoms suggestive of pregnancy unless you are pregnant. Your symptoms (nipple tenderness, veins on breasts, lightheadedness, difficulty in falling asleep, restlessness, sweating, nausea, backaches, abdominal cramps, bloating) could be suggestive of possibility of pregnancy. Look out for development of any other new symptoms suggestive of early pregnancy. Do not delay in 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). Drink plenty of water. Take adequate rest. Maintain healthy diet.
Take care.