Recently stopped BC, when should my body regulate?

I was on the pill for about 9 years and stopped taking it a little over 3 months ago in hopes of becoming pregnant soon. My period has started every 27 days, but I've had spotting for up to 5 days before. I didn't get any positives on the opk this last month, so I'm a little concerned I may not have actually ovulated. I had surgery for endometriosis 2 1/2 months ago which may have also thrown a wrench in things. How long did it take your body to get back to normal after stopping birth control?