Fear period?

I know people believe fear periods come at.different times(?)Does anyone know or have experience/knowledge on what to expect whilst Coco goes through.these stages?She is going to.be 10weeks in one day....so far I seem to have had a happy,confident and calm/hypa puppy.....she's only been scared of the hoover!!what can I exect to change.during her fear period she's been sociaised really well from day 1,has done pretty much everything.there.is.inlondon part from.meeting other dogs(strts a puppy.class.tomorow) and walking.on.the.pavrments
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I think it comes at different times for each dog. I know one dog that couldn't care about vaccums and then at 6 months wouldn't go near one. That was the only change for that dog. Other dogs I've had never went through a fear period.