Is this a sign of interest?

This is a pretty awkward question but I'm going to ask it anyways, sooo today I met a random girl which I found her attractive at school, she was taking some things out of her bag facing my direction from like 3 meters away i looked at her for 2 secs then she looked at me and we both looked down at the same time, and then we both looked back again and she said hi and I said hello. Does this mean something? should I try to speak with her or would this be weird?
Is this a sign of interest?
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