Braxton Hicks? Contractions?

FTM here. I am so lost on what to expect when it comes to BH or contractions. I am 35 weeks now and dilated 1cm, and I've not had any cramping. The only thing I've felt that seems unusual to me is some random lower back pain (usually only lasts a few minutes) and discomfort in my groin. 
Could the lower back pain be BH? And is it normal to dilate and not notice and sort of cramping? Any advice would be greatly appreciated.