BFP preseed users!?

Monica • I`m a 25 year old military wife and mother to our 5 year old son, Rylan and our sweet Maci born 7-17-15.
For any of y'all who used preseed and got a BFP did y'all use it only during your fertile week or did you use it every time you BD for that month? Just trying to decide which one to do. This will be our first month using it and really hoping we get a BFP :)