yes look under the fan leafs and usually u can tell if its female DURING the flowerng stage but vegitational stage usually u cant tell its sex, u should switch the light cycle to 12/12 and wait approx. 1 week and u should get some signs (if u look at it with a magnifying glass like proffesor Burns stated before) just take a magnifying glass and stick in over the camera lens and then take the picture when its in focus and u can open the picture and zoom in on the space u want to look on the stem for sex(balls or hairs) hopefully its a girl dudee name her like smelly sally or some shit lol thats what me and my buddy called this girl in school a few years back lol

much luck bro