Preseed

Hi ladies! 
My husband and I have been ttc for awhile now and I just heard of preseed last week, so I picked some up. 
Today is the first day of my fertile window and I've been getting mixed reviews online. How often do I use it? Everyday of my fertile window? So you'd go through 1 tube a month basically? Can you reuse the applicators? 
How many of you used it and got pregnant? Im reeeeaaaaallllly hoping this is our month!!!