28 days late period negative HPT

i need some advice poh im 28 days late pero all BFN madalas pog msakit ulo sa morning at hapon after work,ndi ako nagsusuka but i am very moody,sore breast,mild cramps,sensitive to smell. nafrufrustrate na ko,i was scared to see a doctor. nakunan nko 3yrs ago..pede kea ako mag pablood test or trans V without orders from OB? thanks meron din poh ba na gaya ng case at nagtuloy sa buntis?