test kits can give false positive results, depending on the time of reading the result, concentration of the urine etc the result can alter,
so you better consult gynecologist and undergo blood test
for pregnancy, and ultrasound
which will rule out the possibility and also can diagnose the cause your symptoms,
your symptoms may be possibly premenstrual symptoms, so after ruling out the pregnancy you can take treatment for it, meanwhile you take antispasmodics and anti emetics to get relief from symptoms.