Gas or contractions?

FTM 34 weeks + 5 days here. I woke up with tightness and diarrhea like pain from my bump this morning, most of the feeling was lower abdomen and my left side (I was asleep on my left side). It was a mixture of cramps and feeling like I needed to poop or gas but couldn't. It lasted for about a little bit over a minute and it was somewhat painful and caused some discomfort, I decided to try and use the bathroom, but nothing. I'm still feeling the same things now, but not as intense and in smaller waves and pressure in my butt area. Doesn't seem timeable but I'm still feeling it in waves . I figure this is probably just a strong bout of bh contractions..? Sorry this seems tmi, but anyone have an idea what this could be?