Preseed advice....

Claire
Hi ladies!!
So I'm CD13 today (usually ovulate around CD18/19) 
First day of quite a lot of EWCM today - shall I start using preseed today, throughout my fertile window (which starts tomorrow) or ONLY use it on my most fertile/peak days??
Praying it'll work for us. We had a chemical pregnancy 6 months ago & really hoping for our rainbow.
Any advice greatly received
Thank you 💖💙💖💙 🌈