Period/like cramps 36+w

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Hi mamas! FTM here and notice that I get a ton of period like cramps mostly after emptying my bladder. They don’t radiate to my back, but they are very low and usually pairs with Braxton Hicks. Are the cramps normal? What’s causing them? Baby low? I feel great otherwise. I don’t have much pressure when walking, I don’t feel exhausted. Still doing my workouts and full nesting! I’m so eager to know what’s happening down there!