I'm glad I'm not the only one who is having them! That makes them seem more normal to me which is very reassuring!
I got them *tons* last pregnancy and am starting to get them very often now too. They really picked up at 29w last time and here I am at 29w and I'm getting them so much, just like last time. Sometimes my uterus just seems irritable and contracts really often. Walking, especially stairs, will do it too. Other times I can't tell what's setting them off cause I'm really relaxed and not doing much. Sometimes they're rare.
It is a subject that stresses me out! [warning: I am about to write about my BH anxiety!]
Last pg I ended up at the hospital one night to have them checked out because they were so frequent (every 5-10m) for hours and I couldn't sleep. The midwife saw the pattern on the monitor and told me I was having too many and prescribed meds :( and put me on bedrest :( both of which sucked. In the end I didn't go into labor until 39w (3w after stopping meds and bedrest) but boy was I worried from 29-36w... my cervix was a little short but never changed dramatically.
My understanding is that "too many" BH can lead to hormonal changes that can in some cases turn into cervix-modifying ones, and then once that ball is rolling it can lead to preterm labor... but the thing is, nobody knows how many is too many. In retrospect, I obviously simply had an "irritable uterus" that contracted a lot without ever leading to cervical change or preterm labor, but I couldn't be sure of that beforehand.
I have several friends, and a close family member who had preterm babies and I would so, so, so like to avoid that. One friend had tons of BH in the weeks before she went into labor at 33w - in retrospect she thinks it should have been a warning sign.
So that is my bad experience with 3rd trimester BH!