That’s normal. Temperature rises 0.5 or more after ovulation and drops down again when the period starts. I’m not sure what Matt would say. But you need to be prepared for a shift at those times in your cycle. Also know that right on ovulation will be a couple of very low basal temperatures. Also normal.
Christinam is right, I am just reading the book “Taking Charge of Your Fertility” by Toni Weschler and she explains so clearly why the shift in temperature happens after ovulation. It is actually pretty cool to chart my temperature now applying both Matt’s and Toni’s principles for metabolism and fertility, respectively