When to know if you should call your doctor??

Al

I’m 22 weeks pregnant with my second little girl and I’ve been having Braxton Hicks which I know is normal but today I also started having lower back pain with it.. it happened once last week too. Just not sure if it’s normal or not?? I don’t want to call and sound like a crazy lady but I also don’t want to not call if it’s not normal!! Just wondering what your thoughts are ladies?? When I sit it’s not bad but only when I’m standing or walking around?? It’s too late to call right now and I wouldn’t want to go the the emergency room so I’ll see how I feel in the morning 🤷🏻‍♀️