Whats your favorite OPK?

Ka

I'm just curious as to what's everyone's favorite OPK and since your MC how long are your cycles? Did your cycle become loner and then return to your normal after a few months?

I'm just trying to get a feel for if I should be using or trying a different OPK and how long I should wait till being concerned that I haven't had a positive OPK after my first period...

Thanks ladies for anything you can tell me! Baby wishes and dust too all for our rainbow babies!