Yard plant brought inside

Alright well about a month and a half ago i just threw some bag seeds in my yard and forgot about them, i then went to mow yesterday and found one plant at about 6in so i put it in a pot and brought it inside. It only has three leaves on each one which is intriguing because i have only ever had stereo typical plants (5 and 7 leaves) so i was wondering if it was some sort of special strain or if it was just because of the time of year it started growing.

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