pregnancy symptoms for about 4wks now...

Hi,
Welcome to ehealthforum,
The symptoms that you describe are suggestive of possibility of pregnancy. If pregnancy symptoms are persistent, you should consider visiting your gynecologist for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately). Blood HCG levels can show accurate results as early as about 11 days post-conception. Take adequate rest. Drink plenty of water. Maintain healthy diet. The urine pregnancy test kits usually start showing positive results after about 20 days post-conception (roughly corresponding to about a week after your missed periods). Sometimes urine pregnancy tests can keep showing you false negative results during early pregnancy as the kits are calibrated ones, so unless the hormone levels in urine reach a certain level, they do not show positive results. You may also consider taking a repeat urine pregnancy test (on an early morning first urine sample) to see if you get positive results, or get it confirmed by a blood HCG test (avoid lot of fluid intake or caffeinated beverage intake in the previous night before test).
Take care.