OPK Confusion - please help!

This is my first month TTC & figuring out how everything works! Glow set my ovulation for 6/4 but I bought a Clear Blue Digital opk test & got a low on 5/30 and a peak on 5/31 (I guess I skipped high??) which changed my ovulation to 6/1. But then on 6/6 and 6/7 I got TONS of EWCM which I now know to be ovulation time. My calendar is showing I’m 2 days late for

AF, but I’m wondering if I actually ovulated on 6/7 and the opk test was wrong? Is that possible?? That would put me 10DPO & not late at all, which is a big difference! Hope this all makes sense & thanks for your help!!