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Sometimes urine pregnancy tests can show you false negative results. It is because urine pregnancy test kits are calibrated ones, so they show positive results only after the hormonal levels in urine have reached a certain level. Blood HCG level estimation is accurate and can detect pregnancy accurately earlier than urine pregnancy tests (at about 11 days post conception). Your current symptoms (discharge from breast, increased sleeping, feeling sick, altered feeling in belly) could be suggestive of possibility of pregnancy. If you suspect to be pregnant, look out for development of any other symptoms suggestive of early pregnancy. Consider visiting your doctor/gynecologist for a thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately).
Take care.