I'm 38 weeks and a few days. For two days last week - Thursday and Friday - I woke up with brownish discharge. This is my 5th baby and the first time I have noticed this happening. I'll tell you what my midwife told me . . . it probably means that you're going to have a baby within the next couple/few weeks :-) Probably not today, but sometimes that happens too.
Basically, it means your body is starting to change and possibly dialate a bit. It is a pre-labor symptom, but it doesn't necessarily mean that baby is coming anytime in the immediate future.
Good luck!
Alyssa