OPK questions and other ovulation questions ?

Back round on my situation :

Had Implanon removed in April 2014 have NOT had a regular period other than spotting off and on since May

(several BFN test including blood work) I got AF one 9/13/14 and it's way more than spotting it's like every thing I have held in for 3 years... so I feel that this in my body regulating back to normal.

So my question is after AF when do I start taking opk test ? Is it too soon to start opk ?should I let my cycle regulate a couple of months then start opk ?