Positive OPK but no BBT spike?

Emily

I got a positive OPK 3 days ago. As of this morning, my temps haven’t gone up AT ALL to confirm ovulation. They did like clockwork last month (this is our 2nd cycle trying). What’s strange, is I looked back on when I got pregnant with my son almost 3 years ago, and the exact same thing happened. We got pregnant right away then and I didn’t really understand what to expect with BBT at the time, so after 5 days of my temps not rising I had just stopped taking it. Has this happened for anyone else?? It’s so frustrating but I also feel hopeful since I got pregnant last time this happened.

This is my positive OPK from 3 days ago: