Contractions are contractions its when they start to form patterns and are consistent u know its true labor. I agree with the first comment. Personally I can do without the prep of braxton hicks I want the labor to start and I be done with it all.
Plus real contractions at least for me have wrapped around my whole lower abdomen starting from the back to the front in a pattern, and while Braxton hicks can be painful I always felt real contractions were more painful and lasted longer
Braxton Hicks contractions are not regular, but random, and dont have a pattern. U will know when they are real if you have one that last a certain length of time and then stops, and come back again for the same length. Then you should time it to see if there is a pattern. Goodluck.