How long does a LH Peak last for? - I'm not sure when I ovulated this month as I ran out of sticks about CD22 - ovulation has been different the last few months.

I started light bleeding this evening - If this is my period then it means I would have ovulated CD18 - I tested twice that day, and the days before and after - neither of them were positive. Could I have missed ovulation at some point around those days? Or would my peak still have shown in the tests?

Fingers crossed I'm spotting because of implantation 🤞🏻❤️