31 Weeks and BM Change?

Sorry for the TMI! I am 31 weeks with my second and had a C-section for my first so I never experienced labor. I've had diarrhea for the last two days and occasional lower abdominal pain (like a pulled muscle not regularly or like Braxton Hicks contractions.) along with the feeling of "pressure". This is also typically accompanied by a lot of baby movement.

For those who have experienced labor and/or preterm labor, does this sound like something to go in or call for? If not then what signs should I go in for?

Thanks in advance!