Quick ovulation?

Wondering if someone could help me understand this a little bit more.

I'm tracking ovulation but the tests are being weird. The one I did was high but not at my peak if you know what I mean. I had typical ovulation pains on one side like I always do. But this was during the evening.

I woke up the pains had gone and my ovulation test had gone down/ lighter.

Could I have ovulated during the night?? Or where I had sex 3 days ago could the sperm already have got to the egg once it arrived and then that's why my peak didn't last long?

Sorry for silly questions I'm 26 with two kids and still don't quite get all this 🫣

Can someone explain thank you