little confused.

Delaney • Mom of a sweet little boy 👶🏼 baby #2 on the way 💙👨‍👩‍👦 🤰🏼

So I had my peak on Dec 28th. So what I’m wondering is would I be 8dpo or 7dpo tomorrow. I know ovulation can last up to 24hrs. I’m itching to test! Lol