Had a sweep on Wednesday, followed by some cramping/contraction-like pains, which tailed off. Last night they returned on and off, and started getting very intense. I'm up now, just sitting, drinking a coffee and waiting for the next one. They're not quite regular yet, ranging from between 6 to 11 minutes apart, but holy crap, they're sore.
Fingers crossed they don't tail off again and that this is it.
Haven't called hospital yet.