Ovulation Question

Hi everybody! I’ll be ovulating this week and I was just going to be taking my temperature to check to make sure I’m ovulating when Glow says I’ll be ovulating. Can I use a regular thermometer or is there a special kind of thermometer that is better? Should I use an ovulation kit too or just use the glow app? I thought I was pregnant last month and was having what I thought were symptoms, but my test was negative. :( Now we are trying again. Thank you in advance!