Ovulating later and later

Rachael • Married to my wonderful wife, mom to D, twins on the way. lots of other roles and titles.
Hey all,
I'm 29. Each month I seem to be ovulating later and later. My first month tracking was day 18, then 21, now today is 21 and I still haven't ovulated. 
I'm terrified my body just won't work. Any idea what's going on?