Am I feeling Braxton Hicks contractions?

Abby

So, the last couple of nights, I've been getting this.. strange feeling in my abdomen. I'm almost 29 weeks (ftm). it almost feels like a really bad menstrual cramp, but my hips and lower back ache. It'll come on, last a minute or 2, then release and I'm fine (except for maybe some remaining soreness in my lower back, like right above my tailbone). they seem to happen towards the evening and later at night. I don't feel any "urge to push" or anything, and it happens- then nothing- it's kind of inconsistent. Are these Braxton Hicks? Should I be concerned? I've got an OB appointment next week, so I'll probably ask my doctor about it then. Thanks for your help!