I have stomach bloat, pelvic pain, abdo pain, frequent urination, dizziness, dull headaches, nausea. complication with a ?pregnancy or ovarian cancer

No way to...: There is no way to tell until you get the appropriate tests for your symptoms. First of all if you suspect you might be pregnant get a pregnancy test. Ovarian cancer is far less common than pregnancy so it is not one of the first things to consider unless you have had a diagnosis of this sort in the past. My recommendation is to see your gynecologist for exam and tests as needed and appropriate.