TTC: 19 Month old & no cycle?

So as of today my daughter is 19 months old & I am still nursing her a couple times a day & once at night. I’ve been wanting another baby for a couple months now, but my cycle hasn’t returned & every time I have “symptoms”, I take a test & it always turns up negative.. (ttc my third baby). With my oldest, my cycle returned when she was 15 months (still nursing) & ended up pregnant when she was 22 months.. is there anyone else that went this long without a cycle? When did yours return?