BBT Trouble

Whitney
Hi guys! I just started tracking my BBT as we will begin actively TTC next month and I wanted a baseline to prepare myself. My BBT chart is nuts! It's all over the place and there is no pattern. And oddly enough, this month, I didn't have the egg white discharge I usually see but I did have spotting (not possible for it to be implantation as my husband has a vasectomy and next week we are going in for the reversal). Has anyone experienced this? Maybe it's because my body knows I'm watching it so closely (😉) that I didn't ovulate or something?