opk question

Ca
I'm new to TTC and appreciate the advice of a veteran....
According to Glow, I should be in my fertile window with my peak day on Tuesday.  However, I've been taking a first response digital opk and have received a no lh surge result each time.  The <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> keeps reconfiguring my peak day with this data. Should I be worried that I'm not ovulating?   I get regular periods.