Urine test for pregnancy
comes positive only after or on the first day of missed period.
If you took the test earlier then it is likely to come negative even if you are pregnant.
Symptoms of tiredness
, breast tenderness and nausea can happen in pregnancy.
In STD's generally there would be some lesions near or in your vagina with discharge , pain , redness and at times fever.
You need to visit a gynecologist for proper examination and ultrasound