Urge to poop..? TMI

Every night, sometimes in the morning, i get this really INTENSE urge to poop and sometimes accompanied with cramping. Its not really consistent (1-3 times within 1-2 hours then it stops) and is quite tolerable. But when i do go i only poop a little bit even though i feel like i have to poop a lot. Im 39 weeks and ftm. Could this be a sign that labor is coming soon?