Can external body heat create a "fever"?

So I’ve felt pretty sick the past few days but I wasn’t actually running a temp until today. That being said, I was wearing upwards of three layers + blankets because I had that weird cold hot sensation you can often get with colds. For reference, I’m running a fever of 102.6. Is it possible Im not actually running a temp and my actual body temperature just naturally heightened past what it was supposed to?