If it is
brown blood it is probably just old blood. A little bit of spotting is normal in pregnancy. If it was me, I would just go into your doctors office. If you go in and tell them whats going on they should see you right away (since you are right there.) I would go into labor and delivery as a last resort, unless you want them to ease your mind like DJCV14 said.
But remember, we are not medically trained, only a support community, so you need to consult everything medical with your doctor.