So I never had this with my first child but this is twice now it's happened and I'm just wondering…

So I never had this with my first child but this is twice now it's happened and I'm just wondering if it's normal. I have lost bits of my mucus plug 2 different times, I've had no bleeding and no cramping but just pressure from her being so low. Please someone tell me if this is normal or not for being 29 weeks?