BBT??🌡

So ive not long started logging or paying attention to my body basal temp, but thought id give it ago as I have a pretty good understanding of my body when it comes to ovulation and when im due on as I get the same symptoms around the same time each cycle. Just recently I had cramping a little earlier on this month and when logging my bbt shows a *spike* for the 25th but according to Glow I ovulate on the 27th, Does this mean I may have ovulated slightly earlier than norm?