Labour?

Hi guys, 
Dunno weither to ring over to midwife or if im being silly..
Ive had dull lower backpain from last night, white thick discharge came out this morning when i coughed, and i feel like ive been hit with a baseball bat downstairs, when i peed this morning their was like a ball between my legs.. 
Opinions please? I am only 35 weeks + 3 days..
Thanks 
X