Is it normal to have a bruised line on my stomach and im 34 weeks pregante?

No. The causes are varied from a simple bruise to something more serious involving blood clotting problems. It is best for you to call your health care provider and have their advice as soon as possible. At best this is a bruise, at worst it could threaten both your baby's and your lives. Call your provider, or whomever they have on call as soon as possible.