braxton hicks/31 weeks/back labor?

Brooke
Off and on yesterday I finally noticed I was having Braxton hicks contractions. A couple times stopped me in my tracks. I tried to rest a lot yesterday bc normally I'm up on my feet at work 10-12 hours. The one main time I got up tonactually do something halfway substantial (laundry-lol), I almost couldn't finish folding clothes. I was standing while I was doing it. I became very out of breath, my thighs (???) ached like crazy and my back was really hurting to the point I just couldn't concentrate, I felt my belly tightening and so I sloppily finished the clothes and went back to bed for relief. What was that all about??? During the night I was woken up twice by my BH. I'm 31 weeks, measuring 36 weeks and they are doing a growth scan later in the week. I just hadn't experienced those symptoms like that before especially not all in one moment. Was that normal?