When to test??

Breanna • Happily married to my best friend! We are trying for baby number 1!!❤️
Been trying to concieve for 2 years.. Only about 5 months with dr help. Just ovulated for the first time! Yay! However my periods are irregular and I didn't ovulate until day 24 and honestly can't predict when my next period will be. When should I test for pregnancy?