Please Help me! Odd ova in stool. Abdominal pain for 3 weeks

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I'm a 24 year old male. After eating a Watermelon, I had bad diarrhea with abdominal pain. I've been to the Dr multiple times and have had stool tests come back negative. I have taken pictures of stool and really curious if anyone could identify what it could be? Any help would be great as this is the 3rd week of pain

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hi lra, rinf your doctor’s, you need to find out what’s going on.