Is this a sex organ

Plants are 4.5 weeks old. No other plants have this on them. It doesnt look like a ball to me. But I am on first grow so I'm not sure.

Doesn't look like one to me, but it would be unusual for a plant to be showing sex this early, especially a female unless you're growing from clones. Just wait, if it's female some pistils will grow out the end.

That looks like a female primordium. Congrats!

Looks like the shape of a female preflower, but I can't see from the pic if it has two little hairs coming out of the end? Give it a few days to a week to be sure, but looks female probably...

They are in 12/12 have been for 4 days. I couldn't see hairs at all. Just what I circled.