Bbt drop day after ovulation?!

Sa

I got glaring positive opks on Saturday, confirmed by blood test. Felt ovulation cramps and had my <a href="https://glowing.com/glow-fertility-program">IUI</a> yesterday. My bbt was also 97.4 (pre-ovulation is in 96 range). This morning it dropped to 96.8.

Should I be worried?