Opk suggestions

Yuleisi
Hi ladies, 
My fiance & I just started to try for our 3rd member of our little family this month. AF is verry irregular so I have no way of knowing ehen I'll be fertile nor when will AF show up. I need some suggestions on which OPK is best to help me conceive? Please comment yor suggestions! 
Thanks & baby dust to you all 😊😊😊✨✨✨