I just ate one slice and a half of some spoiled watermelon?

Hey, so I just ate a slice and a half of some watermelon that tasted odd to me. It tasted sweet BUT sour. So I knew something was off. I searched online whether this was normal, because I tried inquiring with my mom but she didn't reply, and the results said it wouldn't affect me too much so I just ate a... show more Hey, so I just ate a slice and a half of some watermelon that tasted odd to me. It tasted sweet BUT sour. So I knew something was off. I searched online whether this was normal, because I tried inquiring with my mom but she didn't reply, and the results said it wouldn't affect me too much so I just ate a bit. Once my mom came home I gave it to her to taste it, and she confirmed that it was spoiled. now I'm worried that I might catch food poisoning or something :( What should I do to avoid it? I've already taken some pills to combat any form of bacteria in my stomach.
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