CD 2 - First cycle AF post bcp

Br
Hey all!
​After 72 loooong cycle days, I finally welcomed AF - my first after ending birth control pills. I'm super excited to begin TTC. Wondering a couple things: 
When should I begin opks? 
​Can/should I take fertility blend and prenatal vitamins simultaneously?
​And anyone have any sage words of wisdom for a newbie?
​Thanks heaps! Love and baby dust!