Braxton hicks or contractions


I have been having what I believe to be irregular contractions because they are painful in front and in my back. They started being painful at about 35 weeks before that they were just tight and uncomfortable. They don't go away no matter what i do I just have to let them pass. My ob is thinking braxton hicks but I also don't know if I'm dilated at all. What do you lady's think is going on?