Doesn't necessarily mean anything.
It could be your mucus plug. If your mucus plug comes out, go to the doctor. It's a sure sign your getting really close to having the baby.
No you don't have to go to the doctor when your mucus plug comes out. There's nothing they can do unless you're having contractions or your water has broke.
You can lose your mucus plug weeks before going into labor lol
I had some of my mucus plug come out at 27 weeks with my first and the nurse said some of it can come out and it will grow back. If all of it comes out and your water breaks or your having contractions then it's time to call your doctor.