Implantation Dip

I’ve just been temping for a few months and my charts seems to be very similar. A decrease

in temps a few days right before my period. As you can see, they all dip at least 2-3 days prior to AF. Except today, Orange line. It spiked back up. Implantation dip??? I’ve been TTC for 4 years and failed IUI rounds. Unexplained infertility. My periods are very regular. I am scheduled to get af tomorrow. pregnancy cheap test was negative. I have Cramps, and feeling like AF is coming. Normal stuff for me except this spike in temp!! 🤷🏻‍♀️🤞🏽🙏🏽 could it be what I hope it means?!

Thoughts!???