My stomach and upper thighs hurt?

It just started hurting a few hours ago and whenever I sit up a sharp pain hits... I did 20 sit ups today and did a few gymnastics tricks in my backyard today but nothing drastic... Also my upper thighs hurt too?? I don't know if that could b realated?! HELP!!
Ps... I'm 14 and 5"4 and 153 pounds
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