Baby kicking cervix/vagina???

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I'm almost 31 weeks and the last week or so sometimes it feels like he's kicking or punching my cervix/vagina. It hurts, if I'm walking I have to stop and taking another step is soo painful down there! Am I the only one going through this? Is it normal or should I mention it to my ob on my next appointment? And is it actually him kicking or something else?