You have an excellent question! I am an L&D nurse, so I have a little bit of input for you. It sounds like you probably are passing your mucous plug. The only way that it could be meconium is if your membranes are already ruptured. Meconium comes directly from your babies bowels and there is no way that it could be coming out of you, unless there was an outlet to the outside world, hence ruptured membranes. So, if you are not leaking a lot of fluid or had a large gush of fluid, you can be assured that this is not meconium. Also, meconium is black and when diluted in amniotic fluid, it looks green. It sounds like the mucous you are passing (brown tinged), has "old" blood in it. That is all normal. However, if it changes to red or bright red, be sure to call your doctor. Also, remember that passing your mucous plug does not mean that you are going into labor. It just means that your body is preparing for labor. I hope that I have helped a little... Congratulations on your new little one!