BBt - implantation dip?

Hi!!

I am new to bbt and new to <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a>. I ovulated around the 17th/18th according to the ovulation strips (I know glows prediction is definitely wrong, I have very irregular periods). Today my temperature has plummeted. Could this be an implantation dip?

Any input would be appreciated 😊