TMI question.... I'm 31 weeks and today I started loosing my plug... I didn't start loosing it with…

TMI question.... I'm 31 weeks and today I started loosing my plug... I didn't start loosing it with my first until around 38 weeks. is this a cause for concern... I know it doesn't mean labor right away and it wasn't bloody. I have no other signs of labor either but I do know this means I have started to thin and dilate. should I call and let me Dr know or wait until my next appointment?