Believe it or not, a runny or stuffed-up nose without any other cold symptoms is a pretty common condition during pregnancy.
Some women feel as if they have a cold throughout the whole nine months.
Some of the same measures that work for a cold may provide relief for your stuffy nose, too. Fill a bowl with hot water, then cover your head with a towel and lean over the steaming bowl as if you were giving yourself an old-fashioned facial. A hot shower may also help. If you're really suffering from nasal congestion, you might find that a nasal spray provides relief. Keep in mind that it should be used sparingly, and only with your doctor or midwife's permission.