Braxton hicks or contractions????

Ok so I've been getting Braxton hicks since like 24weeks confirmed by my dr, I have to not only see him and specialist for high risk for preterm but now be put on the monitors every two weeks, recently the BH or contractions have been getting more frequent, still irregular but more often, when they happen I can feel them coming on, my lower back gets a dull ache my stomach tightens and becomes really uncomfortable (not really painful) and I get a head rush almost light headed feeling, but before it was just my stomach tightening, not sure if I should go in because they are like still 30 mins apart and do eventually go away