Menstrual cramps at 31 weeks??

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Hey ladies! I'm 31 weeks and four days and for the past couple of days I've been having menstrual like cramps in my lower belly (where you'd usually have them on your period) they're not severe but they're moderate enough for me to go "umm.. Ow?" My OB yesterday said they're most likely Braxton hicks if they go away with resting, hydration, changing positions, etc. Anyone else have experience with these cramps? I have them several times a day