I'm only 33 weeks but I feel miserable! My back has been hurting non stop for the past 2 days and the heating pad just…

I'm only 33 weeks but I feel miserable! My back has been hurting non stop for the past 2 days and the heating pad just isn't working. I'm also having very painful Braxton hicks contractions but they aren't close together. Is this normal or should I be worried?