Ovulation while breastfeeding

Jennifer
DH and I have decided we want to begin trying for our third little one within the next month or so. However, I am still breastfeeding my DD. She is on solid foods, sleeps through the night for 6+ hours at a time and only nurses upon waking, a snack between breakfast and lunch, a snack between lunch and dinner, and then quickly for comfort when she gets her lullaby at bedtime. I am now 8 months postpartum and still no sign of af. I've began testing this month daily for ovulation just in case it started without af showing her face, nothing yet, all negative thus far. 
My question (Lord knows I never thought I'd ask this question 😂) is how can I get af to show up so that my ovulation cycle will kick back up again? We want to give it about two cycles before TTC, but can't really do that if the cycle has yet to kick back up 😒. Help?