I had tons of B-H from about 23 weeks on, especially at night. Some nights, I would have eight or ten an hour. Eventually I was put on terbutaline and ibuprofen, which reduced them but didn't stop them completely. I have read many places about how "false labor" contractions stop when you drink water, lie down on your side, take a bath, etc. But this was not my experience at all! I would lie in bed at night and contract away while hydrating the heck out of myself and taking two or three baths a night sometimes. I am now in my 34th week with my second pregnancy and although my uterus is much less irritable than last time I still have nights where I contract four or six times an hour despite all of the above measures.
With my last pregnancy, I knew I was in labor for a couple of reasons. First, the contractions did start to hurt more, although I realize this might not be true for you if you have a high pain threshold. I had to consciously relax and tell myself not to fight against them, which definitely wasn't true with the B-H. Second, I began to feel the contractions more in my back. Third, and this is a little hard to describe, I had a strong compulsion to finish some work projects I had been doing at home while on bedrest. There was no reason for me to think I was about to go into labor, since I was only at 35 weeks, but I just couldn't stop, working almost all night the night before I went into labor for real. It's as if my body just knew what was happening and I somehow picked up on it.
Just to add something else to the mix, my contractions did not become much more frequent as I moved from B-H to the real thing. I remember writing down how far apart they were and how long they were and being really confused that they weren't getting closer together (or much longer).
Good luck with your labor--Beth