Aye, You really can't mistake the sex of a plant with some patience ... if you notice "sacks, or balls" ... More than one, its most likely male ... if its a single pear shaped "can be ball lookijng also" ... but only one, be patient ... if its a female she'll begin showing hairs coming out ... if you keep looking you'll drive yourself crazy .... once i noticed the sex of the female an male .... i won't forget its process ..... but i remember thinking that i couldn't tell, but one day i woke up ... and boom ... it was female ... others i knew where male about 4-5 days prior of the female showing ... GL with your grow .. but since i got off-topic, yeah .. 2nd or third node down is where i notice mostly first.