is said to occur after 20 weeks of gestation.
You are having high blood pressure
well below 20 weeks,
It means,it may be essential hypertension
So,take low salt diet &start prophylactic medications to prevent preeclampsia after consulting your gynaecologist.
At present,you are having BP 137/83,systolic BP is more than 130,that is not normal,so,you mention it to your gynaecologist.