37 weeks 3 1/2 CM 50% effaced losing mucus plug that is brownish or pink over last 3 days. Will I go into active labor soon?

Mucus plug. The mucus plug is usually dark green to brownish and the size of the palm of your hand. You're probably having some bloody show from last office exam. When you go into labor has more to do with your uterus being ready to go into labor. I imagine it may be from today to the next week or so, but there's no way to guarantee.