Just taking a peek. I don't get out alot, but I seen ya saying about nannas on one. 13 weeks? A auto? Some plants throw out male flowers late in flower as a way for self-preservation. Plants have both sexes in them. And about the preflowers. That is what they are,,, preflowers. Some have more pronounced larger preflowers than others. But most females show sex while in a vegetated state. I woodn't worry to much unless they start to stack up. Photo plants shouldn't flower till lights get cut back. Your doing 24/7 lights? Plants grow at night. They spend all day doing their thing making energy. Then they grow at night. I only do that 24/7 for the first week or so. Then I do a 18/6 myself... GL to ya. and Keepem Green