OPK TEST-What does it really mean?

Emily • I`m 38 TTC#1. I have 3 cysts on my left ovary, a blocked left tube (hydrosalpinx), a blocked right tube and polops on my uterus. Starting round 1 of ivf in Feb/March 2022.
After 4 days of testing at a LOW, I finally got a flashing smiley face yesterday and this morning. It has given me piece of mind just a little bit but I'm still waiting for that solid smile. What do OPK tests really tell us though? I'm confused. Because even if my hormone levels are rising it doesn't necessarily mean that I am ovulating or will ovulate right??