It does sound like you're having what is so wonderfully referred to as "irritable uterus." The bloody show would have given me pause, and I would have gotten checked out by a care provider, as you did. But if you're continuing to have contractions that are painless, no further bloody show, no other symptoms of PTL or UTI, I think you might just be one of those people that contracts a lot. It isn't any fun, I know.
If you keep hydrated, keep your bladder empty, rest when you need to, those kinds of things may help keep contractions at bay. Of course if things start to worsen or get painful, or you think something feels "off" you can always go in and get checked out again.
I hope that things settle down and you are pregnant for 6 or 7 more weeks!