Temping Help


I think my thermometer may not be working correctly. It keeps giving me temps all over the place. It even spiked the day after ovulation and then dropped back down today. I’m temping at the same time every day and before I get out of bed. I attached a picture of my chart and the thermometer I use. Has anyone else had this problem with this brand? (I also know that I missed a day at the dotted line.)