I bled in early pregnancy, and I went to the ER immediately. If nothing else, you'll feel better if you know what's going on.
Depends what color the blood is. If its a brownish color it can be old blood from your last menstrual cycle but if its a bright red it could mean a miscarriage. Get checked out asap.
Go to the ER or to Labor & Delivery.
I bled with bby #2 they said it was a threatned mc. If your scared or need reassurance I would go.