Am I not ovulating?

Kimberly

I had AF after a miscarriage from July 31-August 10. Extra long, usually AF is 5-6 days.... I've been testing my LH since the 10th and nothing. This app said I should have ovulated on 12th, and everyday I log no LH surge it just pushes my ovulation forward a day. Am I ever going to ovulate?? Or is this a problem with the miscarriage? Sorry I don't know all the acronyms for this place. New here.