Ovulation date

So I was a couple of days late for af this month, 27 is my average day but it was 30 this month, never been that late before but I think it was because its my first time ttc and I was over thinking it. So since I was late I'm wondering when my next ovulation day is? Would it be when I should have come on or my new date? I don't want to take ovulation tests yet since it's only my second month ttc and I don't want it to be too serious yet until I've been trying for a while so I don't stress out about it.