So this is a kind of weird question. I’m not new to ttc or pregnancy at all which is why this is throwing me off.

So I ovulated about 7-8 days ago (I use OPKs, temp, and I always get ovulation pain, ewcm. It’s like clockwork. Well now I’m about 7-8dpo and my OPKs are darkening? Why would this happen if I confirmed ovulation? And why so late? (I’ve ovulated late before but never more than 3-5 days)