FTM HELP are these Braxton hicks??

So I woke up at 2:10am to feeling a strong aching feeling going from my back to the front of my bump around my pelvic area on my bump. Wasn't super painful but really uncomfortable. It only lasted about 5 minutes then stopped completely and that's it I haven't had it again. Babygirl was still kicking through it and still is even after. Idk if it was Braxton hicks or what so could someone give me some insight please? Was it preterm labor??? I'm only 21 weeks pregnant Friday....

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