flowered accidently

can flowering be triggered by temperature my plants are on 18/6 and are showing pistles? a couple times temp has dropped to 60 at night and they are in 3 week vedge

This is perfectly normal. A plant will show sex when its in veg phase for so many weeks so no need to worry.

Those are called pre-flowers. That is a sign that your bud is ready to be flowered, but you can continue growing if you like. It is a usefull way to find the sex of a plant without flowering it.