There are a few varieties, and not similar look.
If you can access this search engine link, there are photos- not all may be accurate but they may give you a clue.

Here is a link that might be useful: guava seedling search for pics

Thank you alisonoz. I looked at some of the pictures and they don't look anything like what I have, so it must be a weed. I have yellow strawberry guava, red strawberry guava, and a third type, which is probably Psidium guajava.

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