OPK newbie

Kate • Married 💍, mummy to our beautiful baby girl Layla Mae 🤱 & fur mum 🐶 🇦🇺

So this is my second month using OPKs. Last month I ovulated late-ish in my cycle

This month I have had low readings then straight to peak

Is this normal?

I also had a chemical last month so not sure if that throws things out a little?

Any info/advise/experiences welcome 😊