Being 39 weeks you are almost there anyway but I do understand what you are going through with the prelabour and BH's as I had them with my previous 2 PG's.
All I can say to reassure you is that your body is practicing for the big event and there is a chance that when you do go into labour for real it will be quicker for it.
After a weekend of prelabour at a week overdue I was examined and found to be 3cm dilated! I can't begin to tell you how happy that made me (ie the discomfort wasn't in vein) and then later that evening my labour begun properly and it was 2 hours and bub was in my arms!

hang in there!