HELP Can you ovulate with negative OPKs?

Hey guys, I’m new to bbt charting... I got my peak opk on CD 18. But according to my chart on fertility friend I actually didn’t ovulate until CD 21, but by then my OPKs were completely negative!?!? So is that even possible?

And it makes me worried because we didn’t BD the day I actually ovulated if this is accurate... maybe that’s why I have had such a hard time getting pregnant because I stop BDing the day I get my peak opk but it takes my body like 3-4 days to actually ovulate...

But can someone help, can you ovulate even when OPKs are negative? Or maybe I didn’t even ovulate? My chart seems like a hot mess to me regardless.

And here I am thinking I’ve been 5 DPO but now I’m just 3... ahhh😬😱😂