Cycle/ temping question??

Jennifer • Mom of 2, TTC #3
Alright so I broke down and bought a bbt thermometer a few days ago and just been charting my temps for 3 days and now glow come rely changed my cycle! Originally thought I was going to be ovulating in the upcoming week and glow moved it back a week giving me a 5 week cycle! My cycles are 26-28 days never longer. What gives?