
She sounds like she's in the early stages so looks like you will have some pups in the next couple of days :d
The mucus is normal although they usually have it for a few weeks before and then it breaks away just before the pups are due.
Hope all goes OK. If she seems healthy in herself and happy I wouldn't worry about the vets as it's adding extra stress but if you do have any worried get her to the vet straight away. I wouldn't leave her on her own at all now.