Possible to have found out gender at 12 weeks???

I went to the ER at 12+2 for bleeding- all is well, but the ER Doctor said he thinks it's a boy and I saw what he was referring to on the ultrasound. (It really looked like boy parts!) My OB said no way- it's too early to tell, but then I saw a video saying the nub forms into girl or boy parts before / around 12 weeks.... IS IT TOO EARLY FOR THE DOCTOR TO KNOW AT 12 WEEKS? 
Please comment if u had something similar happen and the 12 week finding was correct or incorrect. 

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