Am I ovulating?

Sadie
Hi everyone! 
I'm starting to get slightly disheartened now :( We have been trying for about 8 months now to get pregnant. I am 32 and I had been using the coil (IUD- Copper) up until 9 months ago, for about 11 years! My app tells me I'm ovulating... But my ovulating sticks tell me differently! I am regular, every 31 days and I have literally taken my ovulating tests every day since the first day off my period to catch when I am ovulating! But nothing! :( does this happen sometimes? Or do I need to face the fact the maybe something is wrong with me and go see a doctor? :(