It could be either of the 2 since you have smost arrived. The BHZ are not usually painful and do not come regularly and last short time. With real labour its painful and the pain increases as contractions get more and more. Labour has sustained contractions which increases with time.
I would suggest getting checked out...the worst that can happen is you being sent home. Better safe than sorry,and I say this because my sister in law said she was contracting but they werent painful and when she finally decided to go get checked and arrived at the L&D center she was 9cm dialated. Good luck! :)