33 week and 5 days and feel like something is happening

Danielle
Yesterday I had tightenings for a good 4 hours 3 mins apart, Didn't come with pain just felt uncomfortable. 
Now today when I woke up constant pressure and feeling like I need a no:2 (sorry), tightenings are coming and going, mild period cramps and increased vaginal discharge ... 
I would normally ring midwife but don't want to incase it's nothing 
HELP !!