Ovulation on day 21?!

Glow and other apps and myself always thought i ovulated on day 15-17 ish as my cycle is usually 30-32 days but I wasn't getting positive tests all month this month, now I've got one. Is it possible to still conceive ovulating this late in my cycle? Maybe this is why we have been ttc for 9 months and nothing's happened? Very confused :(