contractions, braxton hicks or preterm labor?

I am 26+2 weeks and have been getting pretty bad contractions for the past couple days and im not sure if its something to be concerned about or not.. my stomach will tighten up for a minute or two and then release and it seems like its every 10 minutes it happenes. It almost feels like the babies are pushing downwards as well. its suuper painful and i can feel them start to move towards my back