pregnant or stress/paranoid

Hi,
Welcome to ehealthforum.
The urine pregnancy tests done very early in pregnancy can show you false negative results as the kits are calibrated ones, so unless the hormone levels in urine reach a certain level, they do not show positive results. If you were during your fertile days at time of intercourse, chances of pregnancy are possible. Pullout/withdrawal method is associated with highest failures since pre-cum/pre-ejaculatory fluid is known to contain sperms and no man can be 100% sure that pre-cum/pre-ejaculatory fluid did not leak out during vaginal penetration (chances of sperms being present in it are higher after recent ejaculation). Wait and watch for your periods. If periods do not start within 10 days of expected period date, or if you develop new symptoms suggestive of pregnancy, you should consider visiting your doctor/gynecologist at the earliest for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately). Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest. Maintain healthy diet. If you are not ready for pregnancy, but intend to get/remain sexually active, you should consider visiting your gynecologist to get started on suitable regular birth control measures to be protected (after your periods). Be regular with birth control use as instructed. Avoid having unprotected sexual contact if you are not ready for pregnancy.
Take care.