Safe to test the sex?

I recently just put my 2 plants on a 12/12 schedule to force them to show themselves.I intend to put them back on 18/6 after (if female).I have heard that this was ok to do and then i just read something that it could cause the plant to go hermie by doing that.I also read that it wasnt true.Has anyone had that happen or had problems?My plants are going on week 6 of veg when i switched them to flower.Would like to put them back in veg after to let them get bigger once i know sex.(about 10 inches now)If it may cause them to go hermie then should i just leave them in 12/12 if female and see what happens to be safe? first grow.bagseed
 
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