Mama, please contact your OB or go to your nearest hospital/birthing center right away para ma-check properly, 38 weeks na kayo, at any pain near the end ng pregnancy needs professional eyes on it, hindi lang guesswork. Dysmenorrhea-like pain could be many things, at only your doctor can tell if it's labor or something else that needs attention. Huwag mag-antay, okay? Better safe than sorry when you're this far along na.