I had heaps of BH contractions that were often regular in the week or 2 before I went into labour. They hurt a bit but nothing too serious. I kept thinking I was in labour. When I really went into labour it felt completely different and it was obvious it was labour and not BH contractions. The pain went right around my back and was intense.
To the best of my knowledge it is very normal to have tightenings leading up to labour but unless they start getting more painful and closer together then I wouldn't be rushing to the hospital.
Best of luck when he does decide to make his entrance.