Is this normal?

Kenzie • mama of soon to be two! 🥰🖤

I’m a breastfeeding mom and my periods have been all over the place. I am now ten days late and I was like 50 days late for my last period. Last time I was late I took a pregnancy test and it was negative so I feel like their would be no point in taking one right now because I was late last time too? How can I even tell when I’m actually ovulating with such large gaps in between?