contractions or poop?

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for the past couple hours ive been having the urge to go poop, but i go use it and nothing comes out.(sorry tmi) could these be contractions or just that im constipated? ftm, im 39 weeks and 3 days. i have been loosing part of my plug and had a bloody show after my cervix exam 2 days ago so not sure if blood was from the exam 😞 last time i was 3.5 cm dilated.