Mucus plug or discharge?

I am 34 weeks...once a day now for 3 days..I get a wet feeling coming down..go the restroom and my underwear are really really wet with a white slime. I do not have the white slime any other time except the once a day when it comes out with this fluid..don't think it is amniotic fluid because it is just once a day...don't think it is urine because it comes with this white slime. Does the mucus plug usually come with excess fluid also? What do you think this is?