Due 6/4/19.. short cervix, mucus plug?😬😧

While I was on the potty earlier , I noticed a discharge that seemed slimy like snot & it was clearing white . ( I just got swabbed for any type of infection a week ago negative results).. this is my first pregnancy and I’ve had a really ruff pregnancy due to my short cervix so I’m trying to get some advice or info from somebody my anxiety is really high and I have had a lot of cramping off & on sense 5am it is now 11 .. and I just feel very drained and different what should I do ?