Is it normal to NOT have contractions?

I've seen lots of posts on here from people having contractions and had lots of people ask if I've had any contractions or Braxton Hicks... and to be honest, no, I havent. I'm 36 weeks and I've had brief moments of intense pelvic pain that takes my breath away, but those are typically just a second or two of pain and then gone. I haven't had anything that even remotely sounds like a contraction, and I just wondered if that was normal. The reason I ask is because I have IBS and I get abdominal cramping very frequently and I've become very used to it. Is it possible maybe I'm having contractions or BH and just mistaking them for my normal painful abdominal cramps?

I have an appointment with my OB Wednesday so I'll ask then, just wondering if anyone else has any insight.