I honestly would advise temping, opks, checking cp and cm!!
opks give you the idea of when you're ovulating and temping confirms it, my body geared up twice before actually ovulating on the third go! lol
just take it in your stride though, don't stress over thing's too much, like cm and cp, because they can take a while to get used to! they still confuse me . . . haha
I was going to use pre seed this cycle!! lol