TTC - need help

So I’m ready to start for baby #2. The only problem is I’m still breastfeeding and it’s messing with my cycle so I’m not sure how to track ovulation. I got my first pp period the middle of last month (right before my daughter turned 1). 2 weeks later I had another short periodish day or two. I normally use an app to track my period and ovulation, but since I’m not regular that’s kind of hard. I have some ovulation tests, but I’m not even sure when to try to take them at this point. What would be the best method you recommend to figure out my ovulation?