Could be your plug, it can grow back. Your plug doesn't always have to be a browny colour. Also 34 weeks and having the same, this is what midwife has told me. If your really worried speak to your midwife x
Could be normal? Yeast infection? Other infection? If there is no smell it's normal if there is it's not. Only way to find out is through a oak smear. A yeast infection, or other types of infection will not go away on their own. & your ob won't check unless you request to be checked. Good luck: -(