I think i have high blood pressure, at what point should i see a doctor?

Preferably now. Your doctor will confirm whether you have high blood pressure, give you advice regarding your diet, exercise, and the use of medications. If you have a family history of hypertension , salt restriction, avoidance of smoking and alcohol use should be instituted now instead of waiting. You are right to be proactive.

Any time now. The long term complications of hypertension are not worth the wait. If overweight, losing weight will help tremendously in the long run.

The diagnosis of hypertension is made by consistently elevated BP. A BP of 140/90 is the cut off for the diagnosis, but cardiovascular risk for heart attacks, strokes, etc is more than just BP. If I were seeing you, my first question would be why you thought you had high BP? Whatever makes you concerned should be explored in more detail. Go see someone and get answers