Braxton hicks insight? Possible irritable uterus?

So I'm 27+2 weeks pregnant. Yesterday I started a new job and felt pretty good about it. I was on my feet constantly which sucked, but hey, manageable.

Anyway, I started having lower back pain and a few Braxton hicks. I usually have 3-4 a day, but the back pain was new. It was a squeezing pain. I finished my shift and went home and laid in bed with my husband. We had very gentle sex, no orgasm on my part as I just wasnt feeling like putting in the effort. And maybe 10 minutes after we finished, I started having BH. Every two minutes they would come. For over an hour this happened, and of course I tried relaxing, taking a bath, drinking water. But nothing helped. They didnt hurt in the front but the back pain came back, and eventually I called my doctor. While waiting to hear back, they essentially stopped unless I got up to walk or something. They had advised me to go to Labor and delivery, but since they had stopped by that point, I felt no reason to go unless they started up again. I did have a few more later, but nothing crazy.

I'm going to bring it up to the doctor at my upcoming appointment, and will go in to Labor and Delivery if they start up again in that fashion. But has anyone had experience with something like that? I'm worried this job for some reason is too much, and I'm fixing to get ready for work now. I'm terrified of it happening again.

This is just a short span of them timed. Right after I realized I wasnt crazy is when I called my doctor.