Preflowering advice 1-2 weeks in

Hello fellow growers, this is my first thread on this forum and I would really like some advice: I have two fully grown clones from a feminized Greenhouse Seeds Trainwreck that I am in the process of flowering, and I am of the belief that they should be female because they were cloned from a female plant, however I am kind of having some anxiety because of the preflowers that are starting to show. These plants have had a little bit of heat stress affecting them, and I just wanted to get some advice about it. Is it really easy for your clones to herm up? Again, I am not sure of the preflowers and am just anxious about not seeing the white hairs in my 9th day into flower. Newbie grower, this is my first grow attempt. I could use some advice on: 1. Keeping temp. from lights low (growing under T5 because of limited space to reduce heat, but still rather warm in the tent ((80-83 degrees)) 2. I know it depends on strain, but how soon, generally will you be definite that its female? 3. Tips in reducing overall room temp I also took clones from these two during veg, just to throw that out there. Thanks to all advice! Mr.B