First Month w/ BBT - Questions

Jasety • 👨‍👩‍👧 happily married • new grad nurse practitioner • baby #2 on the way!

This is my first month charting BBT and I just had a temp spike today, but I also just has my first positive OPK. I'm confused. Normally the spike means you have already ovulated, but a positive OPK means you will ovulate in 24-48 hrs. My plan is to continue temping to see if the temps stay elevated, but has this happened to anyone before?