Peak or first positive?

S 💍🩵

Should I go based off first positive, cd18, or wait until it starts declining and go off of the true peak. It just keeps rising so I don’t know if I’m already ovulating now since it’s been 24 hours since positive or not.

First cycle using these so I’m a bit lost.

(I started cd10 just not shown in picture, all were below .40)