Period like cramps for the past few days?

35w+2 and I've been experiencing some period like cramps, they're sorta painful, last a few 10-25 seconds... I've been having them morning and night but today I've also had them on and off throughout the day. 
I don't have back pain, no nausea, no bleeding... Just annoying cramps! 
Also last Friday, around 3am a piece of mucus plug fell out, my doctor said there's nothing we can do except wait it out?
Idk if I should wait till I see her next week or go ahead and contact her. :/