Braxton Hicks or Gas?

So I'll be 30 weeks on Thursday and last night I got an aching/throbbing pain by my belly button. It lasted from at least 1 AM to 3 AM, I couldn't track it because I kept falling asleep in between. It was gone when I woke up at 8. It's back now and it's the same thing... is it Braxton Hicks or most likely gas? I can't tell lol I'm a first time Mom and a worrier so it sucks. I'm leaning more towards it gas but wanted to see if anyone else has experienced it or knows.