How do I know if it's ich or not

#1
So I just set up and new guppy breeding tank and let it cycle and when it was complete everything fine I added some guppies on had her fry and it was all good. Then one guppy got this little litte white spot on her fin and it went a away only 1 spot then another guppy got they same thing just one spot on the fin and it only been those two guppies and I haven't seen it since so far and its been 4 days. What can it be?

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