Signs of pregnancy vary from woman to woman, and even from pregnancy to pregnancy.
You may experience some, all or none of these symptoms. If a pregnancy test is positive, most likely you are pregnant. A negative result doesn't always mean you aren't pregnant. A test result can be falsely negative if you are so early in the pregnancy that HCG levels aren't high enough to be detected, or if the urine is too dilute, or if there was an error in the test. If you think you're pregnant and get a negative test result, have an exam or another test to be sure.