Could someone shed some light

I have only started properly charting this month

My temps have been low but guessing this is normal to me as not feeling unwell

I had a spike this morning but It’s early for me to ovulate, however I had a missed miscarriage end of last year and my cycles have gone from 28 days to 29, 26 and my last one 24 so who knows!

I have had no other signs of my ovulation, ie negative opk and no EWCM yet

I have bought a fertility monitor but can’t start using it until next cycle

Does this spike look like possible ovulation or could it just be a temp spike

Is there a way to tell for example if it stays higher that suggests I ovulated?

And how Does coverline work?