well if its 10 days into flower I might bump it up to 2% chance it could be female (from.way less than 1, haha) A lot of my vigorous males have already formed a second or 3rd ball on the bunch of grapes if they are 10 days in. Most have shown more than yours, but Im talking about a cpl specific strains I've started from seed alot, and they were fast finishing indicas. I would never tell someone what to do with their plans or at least I will try not to unless I'm really stoned and forget, But I will say that I don't think they are physically capable of releasing pollen until the size where you can definitely identify them as male, they haven't gone through puberty yet haha. That being said what I do in that spot is to check every node of the suspect plants every day because they can mature in different areas of the same plant at different speeds of course. Also the little tiny thing I found that works is to backlight them (the nodes) with a flashlight or something it seems like I'm able to see the hair better or notice it sooner.