Fertile window

Rebecca

Today is the start of my "fertile window" so I've got a busy week ahead of me and then a long two week wait after that. -_- Looking for some baby dust to be sent my way. And I'm sending lots of baby dust to all of you that are TTC. : )

Also, quick question. When do y'all start using OPKs? The start of your fertile window or do you wait another day or two?