I'm right there with you! I am 26w with twins, but have two other children, so this is my third pregnancy. I have had "BH" contrax for a while, probably since 20 weeks or so, but they've picked up in frequency and intensity in the last week or two.
I asked my MFM (perinatologist) at my last appt about this, and he said he didn't want me contracting more than 3x an hour, including BH or non-painful contrax. I have only approached that once, this past Sunday night, when DH dragged me to a boring work-related dinner and I had to stand around outside in the heat for a while in heels and a dress. Once I got some fluid and cooled down, they passed. My MFM also said that if they put me on the monitor, they'd see 3-4 contrax each hour, even though I might only be feeling 1 or 2 ... and that's normal at this point, with a third pregnancy, and twins.
My OB, on the other hand, said no more than 4 in an hour, and to try a glass of wine + bath + water (mentioned by lots of PP) first. I liked the glass of wine part, and have taken it to heart
Kidding, but I do have a 1/2 glass on many nights when I am contracting.
I also have transvag u/s every other week to check my cervix. It's no big deal ... they simply measure the length of the cervix, then see if it "funnels" or opens when they apply pressure to the fundus of the uterus. So far, I've held steady at 3.7cm long and no funneling. Obviously that will change at some point -- I'll start to thin/efface, and will prob start to funnel, but I think it's a pretty good (positive) sign to still be closed at 25 weeks, which I was. Hopefully you are, too.
So ... feeling any better?! I think you're within normal limits based on your description of events. However, I do agree with other posters that you should trust your intuition; if you're seriously concerned, please -- call or be seen. It's not worth it to be "proud" about this stuff, and the last thing you want to do is to forego asking or going, then have preemies that might have been delayed a bit longer -- at least long enough to get steroid treatments to mature their lungs, if indicated and you're amenable to that intervention (I sure am, especially before 33-34 weeks ... but I'm probably alone in that on MDC!
GL!! Hang in there, mama, and keep me posted.