BBT help

Molly

It’s my first month temping. The <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> predicted ovulation Sunday, and my opk clearblue hit peak on Saturday morning which I assume shows ovulation Sunday as well, however my BBT didn’t spike until Tuesday morning the chart is below... does this mean I most likely ovulated Monday instead?