positive opks

Roslyn β€’ Currently mummy to 3 beautiful girls currently ttc rainbow baby πŸ‘ΆπŸ»πŸŒˆπŸŒˆπŸŒˆπŸ‘ΆπŸ» x after 9 months of ttc our rainbow 🌈 baby is cooking away nicely due April 9 th god is great ❀❀❀
Can someone let me know what days are the best time to conceive when u start get your lines and your positive surge got my positive last month and bedded for those 3 days but think I must have missed my surge a little mixed up how it all works advice would be great thanks xΒ