I think I had one 'proper' contraction last night - I mentioned I get a lot of BH, but as I was readying for bed last night (well, actually sleeping on the sofa for two nights while the landings are varnished) I had a contraction lasting maybe a minute or two which came on at the very same time as strong period pains, and went away with them, too. It was odd - because the tightening sensation felt pretty much identical to BH, it could almost have been that the tightening and the pain were separate things that just happened to have happened at the same time, but it seems to me that that sounds like a proper contraction? Albeit probably a mild one, but still.
So today I'm all, hey, maybe I'll go into labour. I feel a bit sick upon waking and when I stood up I got period type pains again, so we'll see...